Natural and semi-synthetic antibiotics

<p>Applications Protected rac Zearalenone-d6<br></p>

<p>Applications (Z)-7-(((2R)-2-Carboxy-2-((4-oxopentan-2-yl)amino)ethyl)thio)-2-((S)-2,2-dimethylcyclopropanecarboxamido)hept-2-enoic Acid is an impurity of Cilastatin (C441100), prevents renal metabolism of penem and carbapenem antibiotics by specific and reversible dehydropeptidase I inhibition. Antibacterial adjunct.<br>References Finlay, K.R., et al.: Invest. Ophthalmol. Visual Sci., 24, 1147 (1983), Norrby, S.R., et al.: Antimicrob. Agents Chemother., 23, 300 (1983), Washburn, D.E., et al.: J. Antimicrob. Chemother., 12, 39 (1983),<br></p>

<p>Applications Erythrolosamine is a derivative of Erythromycin A Oxime (E650010), which displays no antibacterial activity. It is a potent precursor of ketolide antibiotics.<br>References Basnet, D. et al.: J. Biotech., 135, 92 (2008); LeMahieu, R. et al.: J. Med. Chem., 17, 953 (1974)<br></p>

<p>Applications E-Ceftazidime is an impurity of Ceftazidime Pentahydrate (C244100); which is a third generation cephalosporin antibiotic.<br>References Brodie, A., et al.: Antimicrob. Agents Chemother., 17, 876 (1980); Richards, D.M., et al.: Drugs, 29, 105 (1985); Abounassif, M.A., et al.: Anal. Profiles Drug Subs., 19, 95 (1990)<br></p>

<p>Applications Reagent used in the preparation of Cephalosporin antibiotics.<br>References Choi, K., et al.: J. Antibiotics, 50, 279 (1997), Bharathi, C., et al.: J. Pharm. Biomed. Anal., 43, 733 (2007),<br></p>

<p>Applications Mitomycin (M371900) impurity.<br>References Siegel, D., et al.: Biochemistry, 31, 7879 (1992), Kontou, M., et al.: Oncogene, 21, 2406 (2002),<br></p>

<p>Applications Protected form of FK-506 (Tacrolimus)<br>References Rokaw, M.D., et al.: Am. J. Physiol., 271, C194 (1996), Knoll, G.A., et al.: Brit. Med. J., 318, 1104 (1999),<br></p>

<p>Applications N-Acetyl Cefixime is the N-acetylated analogue and impurity of the third generation cephalosporin antibiotic, Cefixime (C242800).<br></p>

<p>Impurity Posaconazole Impurity;<br>Applications 2,5-Anhydro-1,3,4-trideoxy-2-C-(2,4-difluorophenyl)-4-(hydroxymethyl)-1-(1H-1,2,4-triazol-1-yl)-D-threo-pentitol is building block to synthesize key intermediates towards synthesis of highly active azole antifungals Sch 51048, Sch 56592 and Sch 45012. It is also an impurity/intermediate for posaconazole (P689600).<br>References Saksena, A., et al.: Tetrahedron Lett., 37, 5657 (1996); Lovey, R., et al.: Tetrahedron Lett., 35, 6047 (1994); Saksena, A., et al.: Tetrahedron Lett., 36, 1787 (1995)<br></p>

<p>Applications Erythromycin Glucoheptonate is a derivative of Erythromycin (E649950), an antibiotic.<br>References Delaforge, M. et al.: Biochem. Pharm., 32, 2309 (1983); Niederau, W. et al.: Chemother., 26, 121 (1980);<br></p>

<p>Applications 3,6-Methylene-2,5-piperazinedione is an impurity of Cycloserine (C988800), an antibacterial agent.<br>References Ajo, D., et al.: J. Molec. Structure.,141, 415 (1986); Gentry-Weeks, C., et al.: J. Biol. Chem., 268, 7298 (1993); Alexander, F., et al.: Eur. J. Biochem., 219, 953 (1994); Auger, S., et al.: Biochimie, 87, 231 (2005)<br></p>

<p>Impurity Clarithromycin EP Impurity E<br>Applications 6,11-Di-O-methyl Erythromycin (Clarithromycin EP Impurity E) is a Di-O-alkyl Erythromycin (E649950) is an impurity of Clarithromycin (C559750). Clarithromycin impurity E per British Pharmacopoeia.<br>References Morimoto, S. et al.: J. Antibiot., 43, 286 (1990); Kohno, Y. et al.: J. Antimicrob. Chemother., 26, 503 (1990);<br></p>

<p>Applications Kanamycin A (K137500) derivative.<br></p>

<p>Impurity Terbinafine EP Impurity B<br>Applications cis-Terbinafine Hydrochloride (Terbinafine EP Impurity B) is an impurity in the production of Terbinafine hydrochloride.<br> Not a dangerous good if item is equal to or less than 1g/ml and there is less than 100g/ml in the package<br>References Petranyi, G., et al.: Science, 224, 1239 (1984), Stutz, A., et al.: J. Med. Chem., 27, 1539 (1984),<br></p>

<p>Impurity Ceftazidime EP Impurity H<br>Applications Ceftazidime Methyl Ester (Ceftazidime EP Impurity H) is an impurity of Ceftazidime (C244100). Ceftazidime impurity G.<br>References Miyake, A., et al.: Antimicrob. Agents Chemother., 486, 182 (1989), Seibert, G., et al.: Arzneim.-Forsch., 33, 1084 (1983),<br></p>

<p>Stability Hygroscopic<br>Applications Clindamycin (C580000) impurity in bulk drug.<br>References Zhou, H., et al.: J. Pharma. Biomed. Anal., 41, 1116 (2006),<br></p>

<p>Applications Ciprofloxacin Lactate is an antibiotic that has been used to medicate polymer wound dressing. Ciprofloxacin Lactate has been shown to produce high and sustained serum bactericidal titers against highly susceptible bacteria.<br>References Yu, H., et. al.: J. Appl. Polymer Sci., 101, 2453 (2006); Dudley, M.N., et. al.: DICP, Annals, Pharmacotherapy, 23, 456 (1989)<br></p>

<p>Applications Ixabepilone is an anti-tumor agent used in the treatment of patients suffering from solid tumors, such as metastatic breast cancer.<br>References Duska, L. et al.: Gynecol. Oncol., 135, 44 (2014); Deeken, J. et al.: Cancer Chemother. Pharmacol., 73, 1071 (2014);<br></p>

<p>Applications cis-1-Hydroxy-2,7-diamino Mitosene is derived from Mitomycin C (M371900), which is an antitumor antibiotic. It is antineoplastic. Also, it is an oxazolidinone derivative resulting from a cyclization reaction of bicarbonate with the aziridine ring of aziridinomitosene.<br>References Kinoshita, S., et al.: J. Med. Chem., 14, 13 (1971); Beijnen, J.H., et al.: Anal. Profiles Drug Subs., 16, 361 (1986); Paz, M. M.: Bioorg. Med. Chem. Lett., 20, 31-34 (2010)<br></p>

<p>Applications 4-(2-Fluoro-4-nitrophenyl)morpholine is a reactant in the synthesis of 5-​substituted oxazolidinone derivatives with high antimicrobial activity.<br>References De Rosa, M., et. al.: Eur. J. Med. Chem., 69, 779 (2013)<br></p>

<p>Applications Produced concentration-related relaxations of mouse anococcygeus, in a range similar to that already found for NO and other nitrovasodilators. A potent relaxant of non-vascular smooth muscle. Serves as an NO donor.<br>References Bauer &amp; Fung: J. Pharmacol. Exp. Ther., 256, 249 (1991), Gibson, A., et al.: Brit. J. Pharm., 107, 715 (1992), Shaffer, et al.: J. Pharm. Exper. Ther., 260, 286 (1992), Jansen, A., et al.: J. Pharmacol. Exp. Ther., 261, 154 (1992), Lander, H.M. et al.: J. Immunol., 150, 1509 (1993)<br></p>

<p>Applications N-t-Butyl Linezolid is a derivative of Linezolid (L466500), prototype of the oxazolidinone antimicrobials; inhibits bacterial mRNA translation.<br>References Brickner, S.J., et al.: J. Med. Chem., 39, 673 (1996), Ford, C.W., et al.: Antimicrob. Agents Chemother., 40, 1508 (1996), Rybak, M.J., et al.: Pharmacotherapy, 18, 456 (1998), Stevens, D.L., et al.: Clin. Infect. Dis., 34, 1481 (2002),<br></p>

<p>Impurity Cefixime EP Impurity F<br>Applications Cefixime Ethyl Ester is an ester impurity of the third generation cephalosporin antibiotic, Cefixime (C242800).<br>References Bian, L. et al.: Yao. Fen. Zaz., 30, 872 (2010);<br></p>

<p>Applications (6R,7S)-Cefoperazone Sodium Salt is the enantiomer of Cefoperazone (C242900) as an impurity.<br>References Fabre, H., et al.: J. Pharm. Sci., 73, 611 (1984), Strasters, J., et al.: Anal. Chem., 63, 2503 (1991), Chen, Z., et al.: World Notes Antibiot., 25, 249 (2004),<br></p>

<p>Applications 3-(2-Chloro-6-fluorophenyl)-5-methylisoxazole-4-carboxylic Acid-13C4 Ethyl Ester is an isotope labelled derivative in the synthesis of Flucloxacillin (F419200), a new semisynthetic penicillin with broad spectrum of antibacterial activity.<br>References Macsari, I., et al.: Bioorg. Med. Chem. Lett., 21, 3871 (2011); Cui, Y., et al.: Curr. Sci., 89, 531 (2005);<br></p>

<p>Stability Unstable in Solution<br>Applications Cefathiamidine is an antibacterial agent that exhibits a broad spectrum of bactericidal activity against gram-positive bacteria.<br>References Chen, H.Y., et al.: J. Antimicrob. Chemother., 12, 19 (1983); Philpott-Howard, J., et al.: Scand. J. Infect. Dis. Suppl., 39, 109 (1983); Chen, H.Y., et al.: J. Med. Microbiol., 23, 141 (1987);<br></p>

<p>Stability Hygroscopic<br>Applications Streptidine is a metabolite derivative of Streptomycin (S687500), an antibiotic (antimycobacterial) drug, used for patients suffering from tuberculosis or other infectious diseases.<br>References Granados, O., et al.: Histology and Histopathology, 20, 357 (2005)<br></p>

<p>Applications Tigecycline pentacyclic analog is an impurity of Tigecycline (T440015), one of the very few glycylcycline antimicrobials that exhibit activity against Gram-negative bacteria and also one of the few that also circumvent around the major resistance mechanisms of tetracycline.<br>References Grosse, E., et al.: Clin. Infect. Dis. (Supplement 5), 41, S341 (2005); Livermore, D.: J. Antimicrob. Chemoth., 56, 611 (2005); Stein, G. &amp; Craig, W.: Clin. Infect. Dis., 43, 518 (2006)<br></p>

<p>Applications Pseudoerythromycin A Hemiketal is an impurity of Erythromycin (E649950), an antibiotic.This compound is a contaminant of emerging concern (CECs).<br>References Koch, W.L., et al.: Anal. Profiles Drug Subs., 8, 157 (1979),<br></p>

<p>Applications A derivative of 7-Aminodeacetylcephalosporanic Acid (A604330) derivative with bactericidal properties. Used in the preparation of penicillin and deacetylcephaphosphorin derivatives.<br>References Borowicz, P. et al.: Pol. J. Pharmacol. Pharm., 31, 227 (1979);<br></p>

<p>Impurity Clarithromycin EP Impurity L<br>Applications Clarithromycin (9Z)-Oxime (Clarithromycin EP Impurity L) is an impurity of Clarithromycin (C559750); a semi-synthetic macrolide antibiotic and derivative of Erythromycin (E650000).<br>References Esteban, J., et al.: Tetrahedron Lett., 45, 5563 (2004); Morgan, D., et al.: J. Chromatogr., 502, 351 (1990); Benson, C., et al.: Eur. J. Clin. Microbiol., 6, 173 (1987); Boyanova, L., et al.: J. Med. Microb., 61, 85 (2012); Lin, Z., et al.: Toxicol. Sci., 126, 114 (2012)<br></p>

<p>Applications Lovastatin-d9, is the labeled analogue of Lovastatin (L472225), an antihypercholesterolemic agent. A fungal metabolite, which is a potent inhibitor of HMG-CoA reductase.<br>References Bilheimer, D.W., et al.: Proc. Nat. Acad. Sci. USA, 80, 4124 (1983),<br></p>

<p>Applications N-t-Butyl N-Deactyl Linezolid is a derivative of Linezolid (L466500), a prototype of the oxazolidinone antimicrobials; inhibits bacterial mRNA translation.<br>References Brickner, S.J., et al.: J. Med. Chem., 39, 673 (1996), Ford, C.W., et al.: Antimicrob. Agents Chemother., 40, 1508 (1996), Rybak, M.J., et al.: Pharmacotherapy, 18, 456 (1998), Stevens, D.L., et al.: Clin. Infect. Dis., 34, 1481 (2002),<br></p>

<p>Impurity Linezolid USP Related Compound B<br>Applications Deacetyl Linezolid Thioacetamide is an impurity of Linezolid (L466500), an oxazolidinone antimicrobial which inhibits bacterial mRNA translation. Linezolid USP Related Compound B.<br>References Brickner, S.J., et al.: J. Med. Chem., 39, 673 (1996); Ford, C.W., et al.: Antimicrob. Agents Chemother., 40, 1508 (1996); Rybak, M.J., et al.: Pharmacotherapy, 18, 456 (1998); Stevens, D.L., et al.: Clin. Infect. Dis., 34, 1481 (2002);<br></p>

<p>Impurity Erythromycin EP Impurity B<br>Applications N-Demethyl Erythromycin A (Erythromycin EP Impurity B) is a metabolite of Erythromycin (E649950).<br>References Rich, D.H., et al.: J. Med. Chem., 18, 1004 (1975), Itoh, Z,. et al.: Antimicrob. Agents Chemother., 26, 863 (1984), Omura, S., et al.: J. Antibiotics 38, 1631 (1985),<br></p>

<p>Applications A semi-synthetic cephalosporin antibiotic. Antibacterial.<br>References Goodhart, F., et al.: J. Pharamac. Sci., 62, 133 (1973), Maier, H., et al.: Arzneim.-Forsch., 42, 980 (1992),<br></p>

<p>Applications Found in the metabolic decomposition of Chloramphenicol by Alcaligenes faecalis. A Chloramphenicol (C325030) derivative.<br>References Obojska, K. et al.: Microbiologia Generalis 3, 63 (1971)<br></p>

<p>Applications Intermediate in the preparation of Azamulin<br></p>

<p>Applications (R)-(-)-2-(2,5-Dihydrophenyl)glycine is a cycohexadiene based amino acid used in the preparation of cephalosporin-type antibiotics such as Cephradine (C261800).<br>References Kemperman, G.J. et al.: Eur. J. Org. Chem., 10, 1817 (2001); Takano, S. et al.: Yakug. Zas., 102, 617 (1982);<br></p>

<p>Impurity Potassium Clavulanate EP Impurity K<br>Applications tert-Octylamine (Potassium Clavulanate EP Impurity K) is used in the synthesis of aminomethyltetracycline dericatives as novel antibacterial agents. Also used in the preparation of carbonyl or sulfonylpyrrolidine containing uracil derivatives which have potent effect in the inhibitoon of deoxyuridine triphosphatase inhibitors.<br> Not a dangerous good if item is equal to or less than 1g/ml and there is less than 100g/ml in the package<br>References Clark, R. et al.: J. Med. Chem., 56, 8112 (2013); Miyakoshi, H. et al.: J. Med. Chem., 55, 2960 (2012);<br></p>

<p>Impurity Flucloxacillin EP Impurity B<br>Applications Flucloxacillin Penilloic Acid (Flucloxacillin EP Impurity B) is a degradation product/impurity of Flucloxacillin (F419200).<br>References Aboul K.A., et al.: Anal. Lett., 17, 1667 (1984),<br></p>

<p>Impurity Clarithromycin Impurity O EP<br>Stability Hygroscopic<br>Applications Clarithromycin (9Z)-O-Methyloxime is an impurity of Clarithromycin (C559750); a semi-synthetic macrolide antibiotic and derivative of Erythromycin (E650000).<br>References Morgan, D., et al.: J. Chromatogr., 502, 351 (1990); Benson, C., et al.: Eur. J. Clin. Microbiol., 6, 173 (1987); Boyanova, L., et al.: J. Med. Microb., 61, 85 (2012); Lin, Z., et al.: Toxicol. Sci., 126, 114 (2012)<br></p>

<p>Impurity Terbinafine EP Impurity D; Terbinafine USP Related Compound D; Terbinafine BP Impurity D<br>Applications N-[(2E)-6,6-dimethyl-2-hepten-4-yn-1-yl]-N,4-dimethyl-1-naphthalenemethanamine (Terbinafine EP Impurity D; Terbinafine USP Related Compound D; Terbinafine BP Impurity D) is an impurity of Terbinafine (T107500), an orally active, antimycotic allylamine and a specific inhibitor of squalene epoxidase.<br>References Petranyi, G., et al.: Science, 224, 1239 (1984); Ryder, N.S., et al.: Antimicrob. Agents Chemother., 27, 252 (1985); Evans, E.G.V., et al.: Br. Med. J., 318, 1031 (1999);<br></p>

<p>Applications Cefmetazole Lactone is an impurity of cefmetazole (C242850), which is a semi-synthetic antibiotic derived from Cephamycin. Antibacterial.<br>References Nakao, H., et al.: J. Antibiot., 29, 554 (1976), Iwata, M., et al.: Jpn. J. Exp. Med., 48, 401 (1978), Shindo, H., et al.: Chemoterapy, 27, 64 (1979), Nishida, M., et al.: J. Antibiot., 32, 1319 (1979),<br></p>

<p>Impurity Lovastatin EP Impurity D<br>Applications Lovastatin Dimer (Lovastatin EP Impurity D) is an impurity in Lovastatin (L472225) bulk drug.<br>References Houck, A., et al.: Talanta, 40, 491 (1993),<br></p>

<p>Applications Amino(3-​chlorophenyl)​acetic Acid functions as intermediate useful in the preparation of synthetic penicillins, also used in the structure-activity relationship examination of several drugs containing the benzyl moiety, their roles in biochemical and pharmacological processes.<br>References Hansch, C., et al.: J. Med. Chem., 13, 957 (1970); Holdrege, C. T., et al.: Can. (1975), CA 966853 A2 19750429;<br></p>

<p>Applications Imipenem intermediate.<br></p>

<p>N-[(2R)-3-{[3-Fluoro-4-(4-morpholinyl)phenyl]amino}-2-hydroxypropyl]acetamide is an impurity in a high purity analytical reference standard of 3-fluoro-4-(4-morpholinyl)aniline. It is also a metabolite that may be present in drug products containing 3-fluoro-4-(4-morpholinyl)aniline as the active ingredient, such as fluoroquinolones. N-[(2R)-3-{[3-Fluoro-4-(4-morpholinyl)phenyl]amino}-2-hydroxypropyl]acetamide has been shown to inhibit DNA gyrase and topoisomerase IV, which are enzymes that maintain the integrity of bacterial DNA. It binds to bacterial 16S ribosomal RNA and inhibits protein synthesis, leading to cell death by inhib</p>

<p>The compound (5E)-2,2-dimethyl-7-[(1-naphthalenylmethyl)amino]-5-hepten-3-ynoic acid is a chiral antifungal agent. It was developed to be used as an analytical tool for the determination of plasma concentrations and it can be used in profiling and chiral chromatography. This compound has been shown to have excellent solubility in water and good stability in most organic solvents. The compound is metabolized by the liver and excreted via the kidneys, with a half life of approximately 6 hours. The compound also shows linearity over a wide concentration range, which makes it useful for measuring quantitative changes in plasma concentrations.</p>

<p>(Z)-2-(2-Aminothiazol-4-yl)-2-(hydroxyimino)-N-[(2RS,5RS)-5-methyl-7-oxo-2,4,5,7-tetrahydro-1H-furo[3,4-d][1,3]thiazin-2-yl]methyl} acetamide dihydrochloride is a drug product with purity of &gt;80%. It is a mixture of diastereomers. The impurities are not detected by HPLC. This compound is used in the development of drugs. Its metabolite is also available to purchase.</p>

<p>Azithromycin impurity J, also known as Azithromycin P-Toluenesulfonate, is an impurity of the drug azithromycin. It is an antibiotic that has been shown to be effective in the treatment of protozoal infections, cancer and parasites. Azithromycin impurity J has been shown to bind to DNA gyrase and topoisomerase IV enzymes, which are necessary for bacterial replication. Azithromycin impurity J is a protozoan inhibitor that acts by blocking the synthesis of RNA and DNA. This impurity binds to DNA gyrase and topoisomerase IV enzymes, which are necessary for bacterial replication. Azithromycin impurity J is a protozoan inhibitor that acts by blocking the synthesis of RNA and DNA.</p>

<p>The impurity is a natural product and an API impurity. The impurity is synthesized by the rearrangement of (E/Z)-FK-506 26,28-allylic ester. This impurity has been shown to be present in drug products at concentrations up to 0.0025% w/w. It is found in analytical samples at concentrations up to 0.02% w/w, which may be due to its use as a HPLC standard. The impurity has been studied for metabolism in rats and rabbits and is not metabolized by microsomal enzymes or conjugated with glucuronic acid. The compound has also been shown to have anti-inflammatory properties in mice models and has no cardiotoxic effects on Balb/c mice.</p>

<p>(5S)-5-(Aminomethyl)-3-[3-fluoro-4-(4-morpholinyl)phenyl]-1,3-oxazolidin-2-one is a molecule with a broad spectrum of antimicrobial activity. It is a potent inhibitor of the enzyme metallo-β-lactamase, which is found in Streptococcus faecalis and other bacteria. This molecule also has antibacterial activity against Streptococcus pyogenes and Staphylococcus aureus. (5S)-5-(Aminomethyl)-3-[3-fluoro-4-(4-morpholinyl)phenyl]-1,3-oxazolidin-2 -one is an amide with mass spectrometric and spectroscopic properties that can be used as analytical methods to identify it in biological samples.</p>

<p>Please enquire for more information about 5-Deoxy-Δ5,6-8-epi-tacrolimus including the price, delivery time and more detailed product information at the technical inquiry form on this page</p>

<p>Delta 2 Cefdinir is a cephalosporin antibiotic used for the treatment of respiratory tract infections and skin infections. The drug product is an analytical standard that has been custom synthesized for metabolism studies. It is also used as an impurity standard for synthesis in research and development, as well as for HPLC analysis. Delta 2 Cefdinir is a high-purity, pharmacopoeia grade API with a purity of &gt;98% and contains no detectable levels of natural impurities.</p>

<p>Azithromycin N-ethyl is a drug development and analytical impurity standard. It is used as an analytical reference material for high-performance liquid chromatography (HPLC) and nuclear magnetic resonance spectroscopy (NMR). Azithromycin N-ethyl has been shown to be a metabolite of azithromycin, which is a niche antibiotic with broad activity against Gram-positive bacteria. This product can also be synthesized from erythromycins using methylation. CAS Number: 92594-45-1</p>

<p>N-[(2E)-6,6-Dimethyl-2-hepten-4-ynyl]-1-naphthalenemethanamine (DHEA) is a human metabolite and an endogenous hormone. DHEA has been shown to have antifungal activity against Candida albicans in vitro. It also possesses an inhibitory effect on the growth of some fungi that are resistant to azole drugs, such as Coccidioides immitis, Cryptococcus neoformans and Blastomyces dermatitidis. DHEA has been used in the treatment of pediatric patients with chronic granulomatous disease and is currently being evaluated for use in other pediatric conditions.</p>

<p>Impurity G is an impurity found in the drug Iohexol. It is a synthetic, amide, propylamine, diacetate and methyl anthranilate. Impurity G has been shown to be a catalyst for the production of iodinated contrast media with high yield. This can be used to make the drug Moxifloxacin hydrochloride, which is used to treat bacterial infections such as pneumonia and bronchitis caused by Legionella pneumophila or Mycoplasma pneumoniae. The chemical compound moxifloxacin has anti-inflammatory properties that are due to its ability to inhibit prostaglandin synthesis.</p>

<p>4-[2-[[(6R,7R)-7-Amino-2-carboxy-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-en-3-yl]thio]-4-thiazolyl]-1-methylpyridinium Chloride Monohydrochloride is a drug product under development for the treatment of bacterial infections. 4-[2-[(6R,7R)-7Amino--2carboxy8oxo5thia1azabicyclo[4.2.0]oct2en3yl]thio]-4thiazolyl]-1methylpyridinium Chloride Monohydrochloride is an impurity in the API Methicillin (CAS No. 40082764). Impurities are not necessarily undesirable and may have substantial therapeutic value or provide a desired</p>

<p>Please enquire for more information about Linezolid N-oxide including the price, delivery time and more detailed product information at the technical inquiry form on this page</p>

<p>Erythromycin EP impurity L is a metabolite of erythromycin that is found in the urine of patients taking erythromycin. It is a white to light yellow crystalline powder. Erythromycin EP impurity L has been used as an analytical standard for HPLC and GC-MS, and as a pharmacopoeia reference material. Erythromycin EP impurity L is also known to have anti-inflammatory properties.</p>

<p>Decarboxy ciprofloxacin is a prodrug that is active against bacteria and other microorganisms. It has been shown to have an affinity for the fluoroquinolone binding site on the bacterial ribosome, inhibiting protein synthesis and cell division. Decarboxy ciprofloxacin has been used in animals to treat infections caused by Escherichia coli, Klebsiella pneumoniae, Salmonella enterica, Proteus mirabilis, and Pseudomonas aeruginosa. Decarboxy ciprofloxacin is administered orally in the form of tablets or capsules. The drug binds to metal ions and can be detected with a biosensor that uses an aptamer-coated electrode. This sensor can be used for the detection of both metal ions and fluoroquinolones. <br>Decarboxy ciprofloxacin is also used as a research tool to</p>

<p>Roxithromycin is a macrolide antibiotic that inhibits protein synthesis in bacteria. It binds to the 50S ribosomal subunit, thereby inhibiting bacterial growth. Roxithromycin has been used to diagnose intestinal and esophageal diseases, inflammatory diseases, and cancer. There are some cardiac effects associated with Roxithromycin that may be related to its ability to inhibit serotonin reuptake. This drug also has anti-inflammatory properties and has been shown to be effective against influenza virus infections as well as other infectious diseases such as tuberculosis and HIV/AIDS.</p>

<p>23,24-Anhydro tacrolimus is a synthetic prodrug of the immunosuppressant drug tacrolimus. It has the same pharmacological effects as the parent compound and can be used in its place to avoid adverse reactions. The metabolite of 23,24-anhydro tacrolimus is a natural metabolite of tacrolimus and has been synthesized for research purposes or for use as an analytical standard. 23,24-Anhydro tacrolimus is not an impurity standard, but rather a niche product that is not commercially available from suppliers.</p>

<p>(5E)-2,2-Dimethyl-7-[methyl(1-naphthalenylmethyl)amino]-5-hepten-3-ynoic acid is a drug product that has been custom synthesized. It is available in high purity (&gt;98%) and with analytical data. This chemical is metabolized through a number of metabolic transformations, including hydrolysis by esterases or glucuronidases, oxidation by cytochrome P450 enzymes, reduction by glutathione reductase, or conjugation with glucuronic acid. (5E)-2,2-Dimethyl-7-[methyl(1-naphthalenylmethyl)amino]-5-hepten-3-ynoic acid has been shown to have pharmacological activity on the central nervous system and may be used as an antidepressant drug candidate.</p>

<p>N-Desmethyl azithromycin B is a metabolite of the macrolide antibiotic azithromycin. It is an impurity in the drug product, and is present as an analytical standard for HPLC. N-Desmethyl azithromycin B can be found in the urine of patients taking azithromycin, but at much lower concentrations than the parent drug. This impurity is not toxicologically relevant, but may interfere with some analytical methods.</p>

<p>Metabolite of mupirocin</p>

<p>Please enquire for more information about N-Demethyl-N-(ethylsuccinyl) erythromycin including the price, delivery time and more detailed product information at the technical inquiry form on this page</p>

<p>Pseudomonic acid D sodium is a drug product that is used for the development of novel drugs. It is a natural metabolite of pseudomonic acid A, which is found in the fungus Pseudomonas sp. Pseudomonic acid D sodium is used as an analytical standard to aid in the identification of pseudomonic acid A and its metabolites. Pseudomonic acid D sodium can be synthesized by reacting 2-chloro-4-nitrobenzene with sodium bisulfate. The synthesis proceeds through a sequence of three reactions, namely nucleophilic substitution, electrophilic substitution, and hydrolysis. The structure of pseudomonic acid D sodium has been confirmed using nuclear magnetic resonance spectroscopy (NMR) and mass spectrometry (MS).</p>

<p>Lincomycin impurity B is a chemical substance which is the result of the metabolism of lincomycin. It is found in the urine and feces of patients who have taken lincomycin orally. Lincomycin impurity B has been detected in various commercial formulations of lincomycin, but its concentration varies with different batches. The HPLC standard purity for lincomycin impurity B is up to 99%. Lincomycin impurity B can be used as an analytical standard for HPLC analysis and as an API impurity in drug development. It also may be used as a research metabolite or pharmacopoeia reference material.</p>

<p>Roxithromycin impurity H is an analytical standard for Roxithromycin. It is a metabolite that has been identified in human urine and bile samples as well as in rat plasma following oral administration of Roxithromycin. It is also a byproduct of the synthesis of Roxithromycin, which can be eliminated through purification steps. This compound has not yet been evaluated in humans or animals, but it may cause adverse effects such as gastrointestinal disturbances, headache, or hepatotoxicity.</p>

<p>Ceftazidime impurity H is a by-product that can be found in the synthesis of ceftazidime. It has been detected using magnetic separation and UV detection. Ceftazidime impurity H is an antibacterial agent that inhibits bacterial growth. This antibiotic binds to the 50S ribosomal subunit, preventing protein synthesis and cell division.</p>

<p>Please enquire for more information about 2′,4′′-Bis-O-(trimethylsilyl)-erythromycin 9-[O-(1-ethoxy-1-methylethyl)oxime] including the price, delivery time and more detailed product information at the technical inquiry form on this page</p>

<p>Ceftazidime t-butyl ester is a prodrug of ceftazidime. It is a crystalline, stable form of the drug that can be dissolved in an organic solvent. Ceftazidime t-butyl ester has an average UV detection wavelength with a linear range of 200-600 nm and can be detected at a wavelength of 220 nm. This drug is used to treat infections caused by bacteria, including those that are resistant to other antibiotics, such as penicillin or ampicillin. Ceftazidime t-butyl ester has been shown to be effective against methicillin-resistant Staphylococcus aureus (MRSA) and Clostridium perfringens, although is not active against acid-fast bacteria such as Mycobacterium tuberculosis or Mycobacterium avium complex.</p>

<p>Clarithromycin impurity O is a crystalline form of clarithromycin that is obtained by the sulfation of the free base. It is prepared by adding an acid binding agent to the free base and then dissolving it in water. The sulfate salt of clarithromycin impurity O can be purified by recrystallization. Clarithromycin impurity O has been used as a raw material for clarithromycin, which is a β-lactam antibiotic with activity against Gram-positive bacteria and some Gram-negative bacteria. Clarithromycin impurity O is also used in other pharmaceuticals such as anti-inflammatory drugs and antibiotics. The preparation process starts with the methylation reaction of potassium hydroxide, followed by hydrolysis to produce methyl sulfate and dimethyl sulfate. The methylated product is purified through distillation, vacuum drying, or crystallization, yielding a pure form of methylated product that can be further processed into other</p>

<p>Ciprofloxacin impurity D hydrochloride is a drug product that is an analytical standard. It is also a natural impurity found in Ciprofloxacin. This compound has been synthesized and manufactured to be used as an impurity standard. It exhibits the same physical, chemical, and biological properties as Ciprofloxacin. The CAS number for this substance is 526204-10-4. Impurities such as Ciprofloxacin impurity D hydrochloride may be present in the finished drug product if they are not removed during the manufacturing process. Chemical reactions may also lead to the formation of these substances. The presence of these substances can affect the quality of the drug product and may lead to adverse effects for patients who use them.<br>CAS No.: 526204-10-4<br>Molecular Weight: 258.25<br>Formula: (C8H6ClF2NOS)</p>

<p>Roxithromycin impurity I is a natural metabolite of roxithromycin. The substance has been synthesized in order to serve as an analytical impurity standard for HPLC. Roxithromycin impurity 1 is also a metabolite of roxithromycin, which has been shown to produce pharmacological effects similar to those seen with the parent compound. Roxithromycin impurity I is not an API, but has been developed as a HPLC analytical impurity standard and will be used for metabolism studies.</p>

<p>NMP-ACA is a metabolite of cefepime. It is a synthetic, impurity standard for use in HPLC. It has an analytical purity of &gt;98%. The metabolites of NMP-ACA are not known at this time.</p>

<p>4-Hydroxy azithromycin is an impurity of Azithromycin that is a metabolite of the drug. 4-Hydroxy azithromycin is a synthetic product, which has been synthesized for use as an analytical standard for HPLC and LC-MS/MS. It has also been used as a pharmacopoeia standard for testing antibiotic purity and quality. Metabolism studies have shown that 4-hydroxy azithromycin is not absorbed from the gastrointestinal tract, but is found in the urine and feces.</p>

<p>Erythromycin impurity K is a synthetic impurity of erythromycin, which is an antibiotic drug product. It is typically found in pharmaceutical products that are made from natural sources and is used as a research and development (R&amp;D) standard for the pharmacopoeia. Erythromycin impurity K can be purified by HPLC or other means to create high purity standards for analytical purposes. The chemical name of this compound is 3-[[[3-(2-Amino-4-thiazolyl)-1,2,4-triazol-5-yl]amino]methyl]-1H-indole.</p>

<p>Cefixime is a broad-spectrum oral antibiotic used to treat bacterial infections, including respiratory tract and ear infections. Cefixime is the prodrug of cefixime acid, which is hydrolyzed in vivo to cefixime. This impurity is an analytical standard that can be used for research and development, high purity drug product, API impurity, HPLC standard and niche drugs. It can also be used as a metabolite and an impurity standard. The CAS number for this compound is 1335475-08-5. This chemical has natural or synthetic origins but is not specified.</p>