Toxicologie

Impurity Abacavir - In House Impurity
Applications (1S,4R)-cis-4-Amino-2-cyclopentene-1-methanol D-Tartrate (Abacavir - In House Impurity) is an intermediate of Abacavir (A104990). Abacavir is a carbocyclic 2'-deoxyguanosine nucleoside reverse transcriptase inhibitor and an anti-HIV drug used to treat HIV infection (1). Intracellular enzymes convert Abacavir to its active form, carbovir-triphosphate (CBV-TP), which then selectively inhibits HIV reverse transcriptase by incorporating into viral DNA (2). Abacavir is metabolized in the liver by uridine diphosphate glucuronyltransferase and alcohol dehydrogenase resulting in inactive glucuronide and carboxylate metabolites, respectively.
References (1) Jackson, A., et al.: Antivir Ther. 17, 19 (2012) (2) Yuen, G. J., et al.: Clin Pharmacokinet. 47, 351 (2008)

Applications [[(1R)-2-(6-Amino-9H-purin-9-yl)-1-methylethoxy]methyl]monophenylester is an antiviral agent and a Tenofovir (T018500) intermediate. Tenofovir is an acyclic phosphonate nucleotide analogue and reverse transcriptase inhibitor, used as an anti-HIV agent.
References Shaw, J.-P., et al.: Pharm. Res., 14, 1824 (1997); Wyles, D., et al.: Clin Infect. Dis., 40, 174 (2005); Peng, J., et al.: J. Clin. Pharmacol., 46, 265 (2006); Seminari, E., et al.: J. Antimicrob. Chemother., 60, 831 (2007);

Impurity Ketoconazole EP Impurity D
Applications Deacetyl Ketoconazole (Ketoconazole EP Impurity D) is a Ketoconazole derivative.
Not a dangerous good if item is equal to or less than 1g/ml and there is less than 100g/ml in the package

Applications Sinigrine, is a glucosinolate which is found naturally in Cruciferae including the genus Brassica. When enzymatically hydrolysed, Sinigrine yields isothiocyanates and give a pungent taste. Both Sinigrine, and isothiocyanates, have been shown to have anticancer activity as well as antifungal and antibacterial properties.
References Cools, K., et al.: J. Chromatograohy B., 901, 115 (2012); Okullcz, M., et al.: Materiae Veg., 65 (3), 217 2010;

Applications (S)-2-Benzyl-N,N-dimethylaziridine-1-sulfonamide is a reagent for the synthesis of N-alkylsulfamic acid derivatives. It also has utility for preparing pharmaceutical peptide analog agents.
References Sherman, E. S., et al. Science of Synthesis 40b, 1285 (2008); Polniaszek, R., et al.: PCT Int. Appl. WO 2010115000 A2 20101007 (2010)

Stability Light Sensitive
Applications Luliconazole is an azole antifungal drug.
References Uhida, K., et al.: J. Infect. Chemother., 10, 216 (2004); Niwano, ., et al.: Antimicro. Agents Chemother., 42, 967 (1998),

Stability Hygroscopic
Applications VANCOMYCIN (cas# 1404-90-6) is a useful research chemical.

Applications Alogliptin Benzoate is an oral antihyperglycemic agent that is a selective inhibitor of the enzyme dipeptidyl peptidase-4 (DPP-4). Alogliptin Benzoate is used in the treatment of type 2 diabetes.
References Wang, Y., et. al.: Drugs Future, 33, 7 (2008); Lynn, F., et al.: Diabetes, 50, 1004 (2001); Trumper, A., et al.: J. Endocrinol., 174, 233 (2002); Vollmer, K., et al.: J. Clin. Endocrinol. Metab., 94, 1379 (2009)

Applications N-Formyl Erythromycin A is a derivative of Erythromycin (E649950), an antibiotic medication.
References Koch, W.L., et al.: Anal. Profiles Drug Subs., 8, 157 (1979),

Applications (R)-(+)-2-Amino-3-benzyloxy-1-propanol is used as a reagent to synthesize beta-amino alcohols, compounds that are used as therapeutic agents to treat heart disease. (R)-(+)-2-Amino-3-benzyloxy-1-propanol is also used as a reagent to synthesize 15-membered macrolide antibiotics, drugs that are used to treat respiratory tract infections.
References Fisher, G., et al.: J. Org. Chem., 60, 2026 (1995); Metro, T., et al.: J. Org. Chem., 72, 6556 (2007); Sugimoto, T., et al.: Bioorg. Med. Chem., 20, 5787 (2012)

Applications Stearoyl Ethanolamide is a prolific fatty acid ethanolamide produced by PLD hydrolysis of membrane phospholipids. Stearoyl Ethanolamide is also used for studying the effect on endocannabinoid signalling and BBB integrity in systemic inflammation.
References Kasatkina, L. A., et al.: Biochem. Pharmacol. 174, 113783 (2020)

Applications 3-Methyl Salicylic Acid is a toxic compound, it’s toxicity is similar to salicylic acid. Reagent used in manufacturing and preparation of dyes.
References Egorova, T. V., et al.: Tekstil'naya Promyshlennost , 3, 48 (1987); Keshavarz, M. H., et al.: J. Hazard. Mater., 237, 79 (2012)

Impurity Salmeterol EP Impurity B
Applications A novel antibacterial analog of the antibacterial drug Sulfamethoxazole (S699086).

Applications Levofloxacin Hemihydrate is a S-(-) form of Ofloxacin (O245750), an antibiotic used against gram-negative organisms.
References Kato, M., et al.: Arzneim.-Forsch., 42, 365 (1992); North, D.S., et al.: Pharmacotherapy, 18, 915 (1998); Hwang, D.G., et al.: Br. J. Ophthalmol., 87, 1004 (2003);

Applications Primary alkaloid of various species of Cinchona (Rubiaceae). Optical isomer of Quinidine. Antimalarial; muscle relaxant (skeletal).
References Muhtadi, F.J., et al.: Anal. Profiles Drug Subs., 12, 547 (1983), Kremsner, P.G., et al.: J. Infect. Dis., 169, 467 (1994),

Impurity Azithromycin Related Compound O
Applications Azithromycin N-Ethyl is an analogue of Azithromycin (A927000), an semi-synthetic macrolide antibiotic that is related to Erythromycin (E649950).
References Bright, G.M., et al.: J. Antibio., 41, 1029 (1988);

Impurity Clarithromycin EP Impurity F
Applications 12-O-Methyl Clarithromycin (Clarithromycin EP Impurity F) is a methylated impurity of the semi-synthetic macrolide antibiotic Clarithromycin (C559750). 12-O-Methyl Clarithromycin was shown to inhibit uptake of Clarithromycin into the lung cells.
References Chen, X. et al.: Zhong. Yao., 17, 32 (2008); Yoshida, H. et al.: Jap. J. Antibiot., 53, 615 (2000); Omura, S. et al.: Yakug. Zas., 112, 593 (1992);

Applications N,O-Bis(trimethylsilyl)acetamide is used as a reagent in the synthesis of 4'-spirocyclic phosphono-nucleosides as potential inhibitors of hepatitis C virus NS5B polymerase. Also used as a reagent in the microwave-assisted synthesis of purine nucleosides as selective cholinesterase inhibitors.
Not a dangerous good if item is equal to or less than 1g/ml and there is less than 100g/ml in the package
References Dang, Q., et al.: Tetrahedron Lett., 55, 4407 (2014); Schwarz, S., et al.: Org. Biomol. Chem., 12, 2446 (2014)

Applications Used as an antibacterial agent. LD50 >5000 mg/kg for oral administration to rats.
References Goldenthal, E.I.: Toxicol. Appl. Pharmacol., 18, 185 (1971)

Impurity Ceftazidime EP Impurity A
Stability Hygroscopic, Light Sensitive
Applications ∆2-Ceftazidime, 90% (Ceftazidime EP Impurity A) is a Ceftazidime isomer, an impurity of Ceftazidime (C244100).
References Vilanova, B., et al.: Helv. Chim. Acta, 76, 2789 (1993), Zhou, M., et al.: J. Pharm. Sci., 84, 534 (1995), Baertschi, S., et al.: Chemother. 8, 353 (1997), Porra, R., et al.: J. Pharm. Biomed. Anal., 18, 241 (1998),

Applications 5-Chloro-2-furancarbonyl Fluticasone Furoate is a Fluticasone Furoate(F599510) raw material impurity which is a synthetic corticosteroid derived from fluticasone for treatment of seasonal allergic rhinitis.
References DeWester, J., et al.: Allergy Asthma Proc., 24, 331 (2003), Hughes, S., et al.: Drug Metab. Dispos., 36, 2337 (2008), Meltzer, E., et al.: Clin. Drug Investig., 29, 79 (2009),

Applications Erythromycin Lactobionate is an antibiotic used to reduce the prevalence of drug resistant bacteria as well as keeping constant the efficacy of other antibacterial drugs.
References Kiso, S. et al.: Anticanc. Res., 20, 2827 (2000); Broad, J. et al.: Brit. J. Pharm., 168,1859 (2013); Itoh, Z., et al.: Antimicrob. Agents Chemother., 26, 863(1984)

Applications 4-Chloro-3-pyridinesulfonamide is a building block that has been used as a reactant for the preparation of heterocyclic 4-substituted pyridine-3-sulfonamide derivatives as inhibitors of four isoforms of zinc enzyme carbonic anhydrase.
References Slawinski, J., et. al.: Eur. J. Med. Chem., 69, 701 (2013)

Applications 6-O-Des(6-Amino-α-D-gluocopyranosyl) Amikacin Sulfate is a derivative of Amikacin (A578500), semisynthetic aminoglycoside antibiotic derived from Kanamycin A. Antibacterial.
References Cabana, T., et al.: Antimicrob. Agents Chemother., 3, 478 (1973), Cappelletti, L.M., et al.: J. Antibiot., 36, 328 (1983), Monteleone, P.M., et al.: Anal. Profiles Drug Subs., 12, 37 (1983),

Stability Hygroscopic
Applications Tenofovir Monohydrate is an HIV-1 RT inhibitor and antiretroviral drug.
References Zhao, Z., et al.: Method for preparing medical salts and/or derivatives of tenofovir disoproxil, and their application for preventing and/or treating HBV and HIV/AIDS infections, CN 101574356 (2009);

Impurity Fluconazole EP Impurity B / Fluconazole USP Related Compound A
Applications 4-Defluoro-4-(1H-1,2,4-triazol-1-yl) Fluconazole (Fluconazole EP Impurity B) is an impurity of the antifungal agent Fluconazole (F421000).
References Ramesh, B. et al.: J. Pharm. Res., 4, 1401 (2011); Al-Rimawi, F.: Jor. J. Chem., 4, 357 (2009);

Applications A metabolite of Lamivudine (L172500).
References Soudeyns, H., et al.: Antimicrob. Agents Chemother., 35, 1386 (1991), Denapoli, L., et al.: Nucleosides Nucleotides, 12, 21 (1993),

Applications PSI-6130 is an experimental treatment for hepatitis C. PSI-6130 is a member of a class of antiviral drugs known as nucleoside polymerase inhibitors. PSI-6130 inhibits the hepatitis C virus RNA dependant RNA polymerase called NS5B.
References Clark, J., et al.: J. Med. Chem., 48, 5504 (2005); Stuyver, L., et al.: Antiviral Chem. Chem., 17, 79 (2006)

Applications Hydroxychloroquine O-Sulfate Sodium Salt is an analogue and potential metabolite of the antimalarial drug Hydroxychloroquine (H916900). Studies suggest that there is increased uptake and retention of Hydroxychloroquine O-Sulfate in blood of rheumatoid arthritis subjects. It is a COVID19-related research product.
References Lucherini, T. et al.: Recenti Prog. Med., 33, 446 (1962); Mueting, D.: Nature, 195, 1003 (1962);

Applications 2,2,4-Trimethyl-6(2H)-quinolinone 1-Oxide is a derivative of 2,6-Dihydro-2,2,4-trimethyl-6-quinolone (D449900) which is a metabolite of Ethoxyquin (E892800), an oxidation product of the antidegradant.
References Kahl, R., et al.: Toxicology, 28, 229 (1983), Burka, L., et al.: Xenobiotica, 26, 597 (1996), Bammler, T., et al.: Toxicol. Sci., 54, 30 (2000), Hayes, J., et al.: Cancer, 174, 103 (2001),

Applications Atazanavir is a novel azapeptide HIV protease inhibitor (PI). Antiviral.
References Palella, F.J. Jr., et al.: N. Engl. J. Med., 338(13), 853 (1998), Nolan, D., et al.: Drugs, 63(23), 2555 (2003), Musial, B.L., et al.: Am. J. Health Syst. Pharm., 61, 1365 (2004), Wood, R., et al.: J. Acquir. Immune Defic. Syndr., 36, 684 (2004),

Stability Light Sensitive
Applications An intermediate in the preparation of Omeprazole metabolites.
References Hoffmann, K., et al.: Drug Metab. Disposition, 14, 341 (1986), Andersson, T., et al.: Brit. J. Clin. Pharmacol., 36, 521 (1993),

Impurity Pilocarpine Hydrochloride EP Impurity C
Stability Hygroscopic
Applications Isopilocarpic Acid is a degradation product of Pilocarpine (P441500).
Not a dangerous good if item is equal to or less than 1g/ml and there is less than 100g/ml in the package
References Szepesi, G. et al.: Pharmazie, 38, 94 (1983); Bundgaard, H. et al.: Int. J. Pharmac., 10, 281 (1982);

Applications Succinylacetone (SA) is a specific marker for the inherited metabolic disease, hepatorenal tyrosinemia. It was developed a stable-isotope for the determination of SA in dried blood spots (DBS) and liquid urine using a 13C4-SA as internal standard. The method was applied retrospectively and prospectively for the diagnosis of hepatorenal tyrosinemia and for follow-up of patients under treatment.
References Kvittingen, E., et al.: Inher. Metab. Dis., 14, 554 (1991), Lindstedt, S., et al.: Lancet, 340, 813 (1992), Schulze, A., et al.: Clin. Chem., 47, 1424 (2001), Allard, P., et al.: Clin. Biochem., 37, 1010 (2004),

Applications Epitizide is a diuretic agent.
References Pilsbury, V., et al.: J. Pharm. Pharmacol., 18, 713 (1966), Tisdall, P., et al.: Clin. Chem., 26, 702 (1980),

Stability Too Hygroscopic
Applications Erdosteine Thioacid Diammonium Salt is the active metabolite of Erdosteine (E596050), a mucolytic. Erdosteine was developed for the treatment of chronic obstructive bronchitis.
References Dechant, K., et al.: Drugs, 52, 875 (1996); Braga, P., et al.: Arzneim.-Forsch., 49, 344 (1999); Braga, P., et al.: Antimicrob. Agents Chemother., 43, 1013 (1999); Kuvandik, G., et al.: Toxicol. Pathol., 36, 714 (2008); Koyu, A., et al.: Mol. Cell. Biochem., 331, 43 (2009); Fourches, D., et al.: Chem. Res. Toxicol., 23, 171 (2010)

Stability Light Sensitive
Applications 2',7'-Dichlorodihydrofluorescein as a cell-permeable non-fluorescent probe. It is de-esterified intracellularly and turns to highly fluorescent 2′,7′-dichlorofluorescein upon oxidation.
References Lebel, C., et al.: Chem. Res. Toxicol., 5, 227 (1992), Kjaer, M., et al.: Lipids, 43, 813 (2008), Baron, C., et al.: J. Agric. Food Chem., 57, 4185 (2009),

Applications 4'-Dimethylamino 7,8-Dihydroxyflavone is a synthetic 7,8-Dihydroxyflavone derivative which promotes neurogenesis and exhibits potent antidepressant effect. The 7,8-dihydroxy groups are essential for the agonistic effect. 4'-Dimethylamino 7,8-Dihydroxyflavone displays higher TrkB agonistic activity than that of 7,8-Dihydroxyflavone (D452830).
References Thoenen, H., et al.: Trends Neurosci., 14, 165 (1991); Nibuya, M., et al.: J. Neurosci., 15, 7539 (1995); Kaplan, D., et al.: Curr. Opin. Neurobiol., 10, 381 (2000); Saarelainen, T., et al.: J. Neurosci., 2003, 23, 349 (2003);

Stability Hygroscopic
Applications Dipotassium Glycyrrhizinate is used in improving the dissolution property of amphotericin B (AMB) and the bioavailability of the drug incorporated in suppositories.
References Tanaka, M., et. al.: Chem. Pharm. Bull., 40, 1559 (1992);

Stability Light Sensitive
Applications Anxiolytic. Controlled substance (depressant).
References Merlo, L., et al.: Arzneim.-Forsch., 24, 1759 (1974), Carrara, S., et al.: Eur. J. Clin. Pharmacol., 13, 335 (1978), Marcucci, F., et al.: J. Pharm. Sci., 67, 1470 (1978),

Applications Mebutizide is a thiazide diuretic.
References Madrid A.J. et al.: Rev. Clin. Esp., 114, 143 (1969);

Applications (+)-Costunolide is an inhibitor of osteoclast differentiation, acting as an anti-inflammatory and anti-oxidant agent. It is a sesquiterpene lactone which mediates apoptosis.
References Cheon, Y. et al.: Phytother. Res., 28, 586 (2014); Butturini, E. et al.: Eur. J. Pharm., 730, 107 (2014);

Applications Sulforaphene is an extract from the seeds of Raphanus sativus and displays anti-inflammatory and anti-cancer activity.
References Kim, K. et al.: J. Ethnopharmacol., 151, 503 (2014);

Impurity Levofloxacin USP Related Compound B
Applications Levofloxacin intermediate.
References Liu, Bo; Y., et al.: Bioorg. Med. Chem., 13, 2451 (2005), Lalitha D., et al.: J. Pharm. Biomed. Anal., 50, 710 (2009),

Applications 5-phenyl-1,3-oxazolidin-2-one (cas# 7693-77-8) is a useful research chemical.

Stability Hygroscopic, Light Sensitive
Applications Rifabutin N-Oxide is a metabolite of Rifabutin (R505000) and like its parent compound it exhibits antibacterial activity.
References Medeiros, M., et al.: PCT Int. Appl., 44, (2004); Anand, R., et al.: Antimicrob. AG. Chemother., 32 (684 (1988), Skinner, M.H., et al.: Antimicrob. Agent Chemother., 33, 1237 (1989),

Applications Labelled Dodecyl Phthalate (D525380). Dodecyl Phthalate is used in the preparation of Cytarabine (C998100) derivatives as anticancer agents.
References Aoshima, M., et al.: Cancer Res., 36, 2726 (1976), Wang, N., et al.: Bioorg. Med. Chem. Lett., 15, 4064 (2005), Marie-Helene, G., et al.: Bioorg. Med. Chem., 2009, 17, 6340 (2009),

Applications n-Pentyl 4-Hydroxybenzoate-2,3,5,6-d4 (CAS# 1219798-66-9) is a useful isotopically labeled research compound.

Applications A metabolite of the fluorinated quinolone antibacterial Ciprofloxacin.

Stability Moisture Sensitive, Temperature Sensitive
Applications 2-O-Methyl-α-D-N-acetylneuraminic Acid is a model compound for studies of binding of influenza virus hemagglutinin and metal ions.
References Sauter, N.K., et al.: Biochemistry, 28, 8388 (1989), Sharon, N., et al.: Science, 246, 227 (1989), Nagy, J.O., et al.: J. Med. Chem., 35 (23), (1992), Knibbs, R.N., et al.: J. Biol. Chem., 268 (25), 18524 (1993)

Impurity Mometasone Furoate EP Impurity B
Stability Light Sensitive
Applications (11β,16α,17α)-9-Chloro-17-(2,2-dioxido-5H-1,2-oxathiol-4-yl)-17-[(2-furanylcarbonyl)oxy]-11-hydroxy-16-methyl-androsta-1,4-dien-3-one (Mometasone EP Impurity B) is an impurity of Mometasone Furoate, a topical corticosteroid used as an anti-inflammatory.
References Shapiro, E.L., et al.: J. Med. Chem., 30, 1581 (1987); Graft, D., et al.: J. Allergy Clin. Immunol., 98, 724 (1996)

Applications 5,6-Dihydroyangonin is a derivative of Yangonin (Y100550), a lactone isolated from the Kava plant (Piper methysticum). 5,6-Dihydroyangonin was shown to exhibit potential antibacterial and antifungal activities.
References Keledjian, J., et al.: J. Pharm. Sci., 77, 1003 (1988), Clouatre, D., et al.: Toxicol. Lett., 150, 85 (2004), Mathews, J., et al.: Drug Metab. Dispos., 33, 1555 (2005), Clayton, N., et al.: Exp. Toxicol. Pathol., 58, 223 (2007),

Impurity Azithromycin EP Impurity M
Applications Azithromycin (A927000) impurity. A degradation products of Azithromycin.
References Anon., et al.: Pharmaeuropa, 13, 750 (2001),

Stability Hygroscopic
Applications Used in the preparation of indolizine compounds for use in antifungal combination therapy.

Applications 3-(Trifluoromethyl)-1-methyl-1H-pyrazole-4-carboxylic Acid is used in the synthesis of diaryl ether inhibitors of Toxoplasma gondii enoyl reductase. Also used in the synthesis of 4-carboxamide derivatives acting as antifungal agents.
References Cheng, G. et al.: Bioorg. Med. Chem. Lett., 23, 2035 (2013); Wu, Z. et al.: Molecules, 17, 14205 (2012);

Stability Hygroscopic
Applications Piperacillin sodium is an antibiotic related to penicillin. Also, it possesses anti-microbial activity against enterobacteria.
References Zhang, Y., et al.: Linchuang Wuzhen Wuzhi, 27, 63-65 (2014)

Impurity Sofosbuvir Metabolite GS331007
Applications RO 2433 is the deaminated metabolite of β-D-2'-Deoxy-2'-fluoro-2'-C-methylcytidine, an effective inhibitor of hepatitis C virus (HCV) replication in vitro.
References Asif, G., et. al.: Antimicrob. Agents Ch., 51, 2877 (2007)

Impurity Cefpodoxime Proxetil EP Impurity E
Applications Cefotaxime Proxetil (Cefpodoxime Proxetil EP Impurity E) is an impurity of Cefotaxime (C242950), which is a broad spectrum third generation cephalosporin antibiotic. The name Cefotaxime applies to the isomer having a syn-methoxy imino group.
References Wise, R., et al.: Antimicrob. Agents Chemother., 14, 807 (1978), Muhtadi, F.J., et al.: Anal. Profiles Drug Subs., 11, 139 (1982),

Applications 4-(4-(4-(4H-1,2,4-Triazol-4-yl)phenyl)piperazin-1-yl)phenyl Acetate is an intermediate in the synthesis of Deoxo Anhydro Itraconazole Bromide (D231675). Deoxo Anhydro Itraconazole Bromide is an impurity of Itraconazole (I937500), which is orally active antimycotic drug structurally related to Ketoconazole (K186000). Antifungal.
References Espinel-Ingroff, A., et al.: Antimicrob. Agents Chemother., 26, 5 (1984); Heykants, J., et al.: Mycoses, 32, Suppl 1, 67 (1989); Sugar, A.M.,et al.: Curr. Clin. Top. Infect. Dis., 13, 74 (1993)

Applications The S,S-stereoisomer of Chloramphenicol (C325030). Broad spectrum antibiotic obtained from cultures of the soil bacterium Streptomyces venezuelae. It has a broad spectrum of activity against Gram-positive and gram-negative bacteria. Antibacterial; antirickettsial.
References Bartz, et al.: J. Biol. Chem., et al.: 172, 445 (1948), Gottlieb, et al.: J. Bacteriol., 55, 409 (1948), Szulczewski, D., et al.: Anal. Profiles Drug Subs., 4, 47 (1975), Price, A., et al.: J. Antibiot., 43, 118 (1981), Shalit, I., et al.: Drugs, 28, 281 (1984),

Stability Hygroscopic
Applications Roxithromycin (R700850) structurally related substance in bulk samples. Roxithromycin impurity.
References Gasc, J., et al.: J. Antibiot., 44, 313 (1991, Chepkwony, H., et al.: J. Chromatogr., 914, 53 (2001),

Applications Prednienic Acid is a glucocorticoid steroid. It is used to synthesize various anti-inflammatory compounds such as macrolactonolides by conjugating Prednienic Acid with macrolides.
References Tomaskovic, L., et al.: Bioorg. Med. Chem., 21, 321 (2013);

Applications 3-(7-Cyano-5-(2-nitropropyl)indolin-1-yl)propyl Benzoate is used in the preparation of Silodosin (S465000), an α1a-adrenoceptor antagonist. It is used in treatment of benign prostatic hypertophy.
References Shibata, K., et al.: Mol. Pharmacol., 48, 250 (1995); Murata, S., et al.: J. Urol., 164, 578 (2000)

Impurity Mometasone Furoate EP Impurity A
Applications Mometasone Furoate Impurity A (Mometasone EP Impurity A) is an impurity of Mometasone Furoate, a topical corticosteroid used as an anti-inflammatory.
References Shapiro, E.L., et al.: J. Med. Chem., 30, 1581 (1987); Graft, D., et al.: J. Allergy Clin. Immunol., 98, 724 (1996)

Applications Lamivudine epimer.
References Chang, C., et al.: J. Biol. Chem., 267, 13938 (1992), Jeong, L., et al.: J. Med. Chem., 36, 181 (1993),

Stability Hygroscopic
Applications A pro-drug of Ganciclovir. Used in treatment of retro-virus.
References Acosta, E., et al.: Clin. Pharmacol. Ther., 81, 867 (2007), Nassetta, L., et al.: J. Antimicrob. Chemother., 63, 862 (2009),

Stability Hygroscopic
Applications Desacetyl Rifampicin Quinone is an impurity of Rifampicin (R508000).
References Wilson, W.L. et al.: J. Chrom., 144, 270 (1977);

Applications An impurity of Isoniazid (I821450), which is an antibiotic for treatment of Mycobacterium tuberculosis and inhibits mycolic acid biosynthesis. Intermediate used for the synthesis of analogs of antitumor agent 1-acetyl-2-picolinoylhydrazine.
References Brewer, G.A., et al.: Anal. Profiles. Drug. Subs., 6, 183 (1977), Weber, W.W., et al.: Clin. Pharmacokinet., 4, 401 (1979); Rutner, H., et al.: Cancer. Chem. Rep., 58, 803 (1974)