Steroids and Derivatives

<p>Impurity Levonorgestrel EP Impurity M<br>Applications 6(7)-Dehydro Norgestrel (Levonorgestrel EP Impurity M) is a Norgestrel (N689500) impurity.<br>References Gorog, S., et al.: J. Chromatogr., 400 177 (1987),<br></p>

<p>Applications (Z)-Guggulsterone acts as an α-glucosidase inhibitor also known as a hypolipidemic agent.<br>References Yang, D. et al.: J. Lipid Res., 53, 529 (2012); El-Mekkawy, S. et al.: Nat. Prod. Res., 27, 146 (2013);<br></p>

<p>Impurity Betamethasone EP Impurity C<br>Applications (16β)-17,21-Dihydroxy-16β-methyl-pregna-1,4,9(11)-triene-3,20-dione (Betamethasone EP Impurity C) is used in biological studies to perform preclinical characterization of VBP15, a novel anti-inflammatory delta 9,11 steroid. This compound is also used in analytical studies to determine the stability from reversed-phase high performance liquid chromatography (RP-HPLC) to separate low levels of dexamethasone and other related compounds from betametasone, which is an active pharmaceutical ingredient.<br>References Reeves, E.K.M., et al.: Bioorg., Med. Chem., 21, 2241 (2013), Xiong, Y., et al.: J. Pharm. Biomed. Anal., 49, 646 (2009)<br></p>

<p>Applications 17α-Progesterone is a testosterone precursror generated from cholesterol. Also used as a diagnostic agent in the identification and study of ovarian Leydig cell tumor disease.<br>References Vesely, D. et al.: Proc. Natl. Acad. Sci. USA., 76, 3491 (1979); Arhan, E. et al.: J. Pediatric Endocrinol. Metab., 21, 181 (2008);<br></p>

<p>Applications An inhibitor of steroid biosynthesis. Used as an adrenocortical suppressant. Used in the treatment of breast cancer.<br>References Komanicky, P., et al.: J. Clin. Endocrinol. Metab., 47, 1042 (1978), Mori, Y., et al., Chem. Pharm. Bull., 29, 2646 (1981), Williams, C.J., et al.: Cancer Treat. Rep., 71, 1197 (1987)<br></p>

<p>Applications Δ7-Avenasterol is an analog of Stigmasterol (S686750); a plant sterol that is used as a precursor in the synthesis of progesterone.<br>References Han, P., et al.: Biotechnol. App. Biochem., 54, 105 (2009); Matsunaga, I., et al.: Anal. Biochem., 393, 222 (2009); Huang, C., et al.: Plant Physiol., 150, 1192 (2009)<br></p>

<p>Stability Hygroscopic<br>Applications A metabolite of Estradiol (E888000).<br>References Agasan, A., et al.: J. Immunol. Methods., 177, 251 (1994), Stone, R., et al.: Science, 265, 308 (1994), Tacey, R., et al.: J. Pharm. Biomed. Anal., 2, 1303 (1994),<br></p>

<p>Applications 24(R/S)-Hydroxycholesterol-d7 is used in the study of biochemical methods for quantitative detection of steroids containing quantitative charge tags and oxidizing agents and using mass spectroscopy for detection.<br>References Groffoths, Williams., US 20150233953, (2015)<br></p>

<p>Impurity Medroxyprogesterone Acetate USP Related Compound B<br>Applications An orally active progestogen used in hormone replacement therepy (HRT), in the past has been used as a component of oral contraceptives.SMedroxyprogesterone Acetate USP Related Compound B.<br>References Pan, Q., et al.: Mol. Hum. Reprod., 13, 797 (2007), Matsson, P., et al.: J. Pharmacol. Exp. Ther., 323, 19 (2007), Jukosky, J.A., et al.: Bull. Environ. Contam. Toxicol., 81, 230 (2008), Cherkasov, A., et al.: J. Med. Chem., 51, 2047 (2008),<br></p>

<p>Applications A steroid hormone with weak androgenic activity. It is metabolized from Testosterone (T155000) in the liver and is used in doping analysis to detect testosterone misuse. Controlled Substance.This compound is a contaminant of emerging concern (CECs).<br>References Park, J., et al.: J. Anal. Toxicol., 14, 66 (1990), Palonek, E., et al.: J. Steroid Mol. Biol., 55, 121 (1995), Aguilera, R., et al.: Clin. Chem. 47, 292 (2001), Flenker, U., et al.: Steroids, 73, 408 (2008),<br></p>

<p>Applications Pregnenolone Carbonitrile is a glucocorticoid receptor antagonist that induces the expression of the CYP3A family of steroid hydroxylases and modulates sterol and bile acid biosynthesis in vivo. Pregnenolone Carbonitrile is an an activator of rat pregnane X receptor (PXR).<br>References Kliewer, S.A., et. al.: Cell, 92, 73 (1998); Savas, U., et. al.: Drug Metab. Dispos., 28, 529 (2000)<br></p>

<p>Impurity Betamethasone Valerate EP Impurity E<br>Applications Betamethasone 21-Valerate (Betamethasone Valerate EP Impurity E) is an isomeric impurity of Betamethasone 17-Valerate (B327075), as an corticosteroid. Betamethasone 21-Valerate was generated in the stress study of the active drug Betamethasone 17-Valerate (B327075).<br>References Caron, J.C., et al.: J. Pharmaceut. Sci., 73, 1703 (1984); Stouch, T.R., et al.: J. Med. Chem., 29, 2125 (1986);<br></p>

<p>Stability Hygroscopic<br>Applications Cardiotonic.<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 Foerster, et al.: Arch. Int. Pharmacodyn. Ther., 159, 1 (1966), Jakovljevic, I.M., Anal. Profiles Drug Subs., 3, 149 (1974)<br></p>

<p>Applications A metabolite of Eplerenone. Used in combination therapy for treatment of cardiovascular disorders.<br>References Staessen, J., et al.: J. Endocrinol., 91, 457 (1981), de Gasparo, M., et al.: J. Pharmacol. Exp. Ther., 240, 650 (1987), MacFadyen, R., et al.: Cardiovasc. Res., 35, 30 (1997),<br></p>

<p>Impurity Progesterone EP Impurity C<br>Applications 20β-Dihydroprogesterone (Progesterone EP Impurity C) is an impurity of Progesterone (P755900), a steroid hormone secreted by the corpus luteum. Progesterone have various significant physiological roles, such as inducing the maturation and secretory activities of the uterine endothelium and the suppression of ovulation. Progesterone is also implicated in the etiology of breast cancer.<br>References Anderson, E., et al.: Breast Cancer Res., 4, 197 (2002), Lanari, C., et al.: Breast Cancer Res., 4, 240 (2002), Albrecht, E.D., et al.: Front. Biosci., 8, 416 (2003), Qiu, M., et al.: J. Steroid Biochem. Mol. Biol., 85, 147 (2003),<br></p>

<p>Applications Testosterone 17-Decanoate, is an ester of Testosterone (T155000). Testosterone 17-Decanoate, can be used as a potential long-acting male contraceptive, with the combination of subcutaneous etonogestrel implants .<br>References Brady, B. M., et al.: Human Reproduction, 21 (1), 285 (2006); Themmen, A., et al.: Endocr. Rev. 21, 551 (2000);<br></p>

<p>Applications 2-Methoxy-17α-ethynyl Estradiol is a metabolite of the potent synthetic estrogen 17α-Ethynylestradiol (E685100).<br>References Maggs, J.L. et al.: Xenobiotica, 13, 421 (1983); Maggs, J.L. et al.: Biochem. Pharmacol., 32, 2793 (1983); Abdel-Aziz, M.T. et al.: Steroids, 15, 695 (1970);<br></p>

<p>Applications 17-Hydroxy-3,11-dioxo-androsta-1,4-diene-17β-carboxylic Acid is an intermediate used to prepare (11β,​17α)​-17-​[(Ethoxycarbonyl)​oxy]​-​11-​hydroxy-​3-​oxo-​androsta-​1,​4-​diene-​17-​carboxylic acid (E890570) which is a derivative of Loteprednol Etabonate (L471400), an ophthalmic corticosteroid.<br>References Alberth, M., et al.: J. Biopharm.Sci., 2, 115 (1991), Bodor, N., et al.: Pharm. Res., 9, 1275 (1992), Bartlett, J.D., et al.: J. Ocul. Pharmacol., 9, 157 (1993)<br></p>

<p>Applications 5-(4-Fluorophenyl)-2,3-dihydro-3-(1-methylethyl)-2-oxo-N,4-diphenyl-1-[2-tetrahydro-4-hydroxy-6-oxo-2H-pyran-2-yl]ethyl]-1H-pyrrole-3-carboxamide is a photodegradation product of Atorvastatin (A791750).<br>References Cermola, F., et al.: Tetrahedron., 62, 7390 (2006);<br></p>

<p>Applications A metabolite of Testosterone (T155000). It is a promising androgen for male hormonal contraception.CONTROLLED SUBSTANCE<br>References Glass, A., et al.: J. Clin. Endocrinol. Metab., 45, 1211 (1977), Behre, H., et al.: Eur. J. Endocrinol., 140, 414 (1999), Nieschlag, E., et al.: Steroids, 68, 965 (2003), Wang, C., et al.: J. Clin. Endocrinol. Metab., 91, 460 (2006),<br></p>

<p>Applications A metabolite of Cholesterol. Its membrane organizing properties could have implications in Altzheimer’s disease.<br>References Wang, J., et al.: Biochemistry, 43, 1010 (2004), Lemaire-Ewing, S., et al.: Cell Biol. Toxicol., 21, 97 (2005), Fuda, H., et al.: J. Lipid Res., 48, 1343 ( 2007), Sasaki, H., et al.: Metabolism, 56, 357 (2007); S.L. Regen et al.: J. Amer. Chem. Soc., 131, 12354 (2009)<br></p>

<p>Applications A labelled progesterone receptor antagonist with partial agonist activity. Abortifacient.<br>References Healy, D.L., et al.: J. Clin. Endocrinol. Metab., 57, 863 (1983), Rauch, M., et al.: Eur. J. Biochem., 148, 213 (1985), Baulieu, E.E., et al.: Science, 245, 1351 (1989), Brogden, R.N., et al.: Drugs, 45, 384 (1993)<br></p>

<p>Applications Dihydrodigoxin is a cardioinactive metabolite of Digoxin (D446575) that gets excreted in the urine after Digoxin administration in humans.<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, D.R., et al.: Drug Metab. Dispos., 2, 148 (1974); Reuning, R.H., et al.: Drug Metab. Dispos., 13, 51 (1985); Butler, V.P., et al.: Pharmacology, 221, 123 (1982)<br></p>

<p>Applications 17-Hydroxy Pregnenolone, is a metabolite of Pregnenolone (P712200).<br>References Kramer, R., et al.: J. Steroid Biochemi., 18, 715 (1983), Hiwatashi, A., et al.: J. Biochem., 98, 619 (1985), Eiichi, T., et al.: J. Pharmacol. Sci., 95, 140 (2004),<br></p>

<p>Estrone sulfate sodium, an inactive estrogen ester, transforms into estrone via steroid sulfatase. It's studied for targeting polypeptide transporters.</p>

<p>Impurity Norethindrone Acetate EP Impurity G<br>Applications 6-Oxo Norethindrone Acetate (Norethindrone Acetate EP Impurity G) is an oxidative product of Norethindrone acetate (N675990).<br>References Schroff, A.P., et al.: Anal. Profiles Drug Subs., 4, 268 (1975); Singh, H., et al.: Am. J. Obstet. Gynecol., 135, 409 (1979)<br></p>

<p>Applications (11α,16α)-9,11-Epoxy-17,21-dihydroxy-16-methylpregna-1,4-diene-3,20-dione, can be used for the synthesis of Calicoferol E, a vitamin D3 analogues.<br>References Vir Singh, T., et al.: ARKAT USA, INc., (2002);<br></p>

<p>Applications Anti-inflammatory.<br>References Buchwald, P., et al.: Steroids, 73, 193 (2008), Holbeck, S., et al.: Mol. Endocrinol., 24, 1287 (2010),<br></p>

<p>Applications 20α-Dihydro Pregnenolone is a metabolite of Pregnenolone (P712200).<br>References Purdy, R., et al.: J. Med. Chem., 33, 1572 (1990), Bixo, M., et al.: Brain Res., 764, 173 (1997), Huang, X., et al.: J. Biol. Chem., 275, 29452 (2000),<br></p>

<p>Applications Sodium Pregnenolone-17alpha,21,21,21-d4 Sulfate (CAS# 1485492-21-4) is a useful isotopically labeled research compound.<br></p>

<p>Applications di(2-Hydroxy Atorvastatin-d5) Calcium Salt is the labeled analogue of di(2-Hydroxy Atorvastatin) Calcium Salt (H828930), a metabolite of Atorvastatin Calcium Salt (A791750), a selective, competitive HMG-CoA reductase inhibitor. Atorvastatin is the only drug in its class specfically indicated for lowering both elevated LDL-cholesterol and triglycerides in patients with hypercholesterolemia.<br>References Kearney, A.S., et al.: Pharm. Res., 10, 1461 (1993); Heinonen, T.M., et al.: Clin. Ther., 18, 853 (1996); Whitfield, L.R., et al.: Eur. J. Drug Metab. Pharmacokinet., 25, 97 (2000)<br></p>

<p>Impurity Ethinylestradiol EP Impurity D<br>Applications 17b-Estradiol is the major estrogen (1) secreted by the premenopausal ovary (2).This compound is a contaminant of emerging concern (CECs). Drinking water contaminant candidate list 3 (CCL 3) compound as per United States Environmental Protection Agency (EPA), environmental, and food contaminants.<br>References 1. Salole, E. et al.: Anal. Profiles Drug Subs. 1986 15, 23 283-3182. Lievertz, R. et al.: Am. J. Obstet. Gynecol. 1987 May;156(5):1289-93.<br></p>

<p>Impurity Levonorgestrel EP Impurity B<br>Applications 13-Ethyl-17-hydroxy-18,19-dinor-17α-pregn-5(10)-en-20-yn-3-one (Levonorgestrel EP Impurity B) is an impurity of Levonorgestrel.<br>References McGinty, D., et al.: Endocrinology, 24, 829 (1939), Belanger, A., et al.: Steroids, 37, 361 (1981), Nieman, L., et al.: J. Clin. Endocrinol. Metab., 61, 536 (1985), Klebe, G., et al.: J. Med. Chem., 37, 4130 (1994),<br></p>

<p>Applications Labelled Medroxyprogesterone, an orally active progestogen used in hormone replacement therepy (HRT), in the past has been used as a component of oral contraceptives.<br>References Pan, Q., et al.: Mol. Hum. Reprod., 13, 797 (2007), Matsson, P., et al.: J. Pharmacol. Exp. Ther., 323, 19 (2007), Jukosky, J.A., et al.: Bull. Environ. Contam. Toxicol., 81, 230 (2008), Cherkasov, A., et al.: J. Med. Chem., 51, 2047 (2008),<br></p>

<p>Applications Isotope labelled intermediate in the synthesis of Dexamethasone (D298800), a glucocorticoid anti-inflammatory agent.<br>References Liu, Y., et al.: Anal. Bioanal. Chem., 395, 591 (2009), Rodgers, A., et al.: Chem. Res. Toxicol., 23, 724 (2010), Gohil, V., et al.: Nat. Biotechnol., 28, 249 (2010),<br></p>

<p>Applications Selective aldosterone receptor antagonist (SARA), structurally similar to Spiranolactone. Eplerenone is used alone or in combination with other medications to treat high blood pressure. Eplerenone is in a class of medications called mineralocorticoid receptor antagonists. It works by blocking the action of aldosterone, a natural substance in the body that raises blood pressure.<br>References de Gasparo, M., et al.: J. Pharmacol. Exp. Ther., 240, 650 (1987), Delyani, J.A., et al.: Cardiovasc. Drug Rev., 19, 185 (2001), Burgess, E., et al.: Expert. Opin. Pharmacother., 5, 2573 (2004), Ravis, W.R., et al.: J. Clin. Pharmacol., 45, 810 (2005),<br></p>

<p>Applications Testosterone ester.<br>References Zarzycki, P., et al.: Anal. Bioanal. Chem., 391, 2219 (2008), Talarovicova, A., et al.: Hormon. Behav., 55, 235 (2009),<br></p>

<p>Applications Glucocorticoid; antipsoriatic.<br>References Pearlman, R., et al.: Int. J. Pharm., 18, 53 (1984), Neufeld, E., et al.: J. Chromatogr., 718, 273 (1998),<br></p>

<p>Stability Light Sensitive<br>Applications An antineoplastic (hormonal).<br>References Giudici, D., et al.: J. Steroid Biochem., 30, 391 (1988), Evans, T.R.J., et al.: Cancer Res., 52, 5933 (1992), Zilembo, N., et al.: Brit. J. Cancer, 72, 1007 (1995)<br></p>

<p>Applications A metabolite of Norethindrone (N676000).<br>References Layne, D.S., et al.: Biochem. Pharmacol., 12, 905 (1963),<br></p>

<p>Impurity Clobetasol Propionate EP Impurity A / Betamethasone Dipropionate EP Impurity B<br>Applications Betamethasone 17-Propionate (Clobetasol Propionate EP Impurity A) is a degradation product of Betamethasone. Glucocorticoid.<br>References Andersson, P., et al.: J. Pharm. Pharmacol., 36, 763 (1984), Wurthwein, G., et al.: Biopharm. Drug Dispos., 11, 381 (1990), Samtani, M., et al.: J. Pharm. Sci., 93, 726 (2004), Samtani, M., et al.: Drug Metab. Dispos., 33, 1124 (2005),<br></p>

<p>Applications Dutasteride β-Dimer is a dimer impurity of Dutasteride (D735000); a dual inhibitor of 5α-reductase isoenzymes type 1 and 2. Dutasteride is structurally related to Finasteride (F342000) and is used in the treatment of benign prostatic hyperplasia.<br>References Bakshi, R.K., et al.: J. Med. Chem., 38, 3189 (1995); Gisleskog, P.O., et al.: Brit. J. Clin. Pharmacol., 47, 53 (1999); Djavan, B., et al.: Expert Opin. Pharmacother., 6, 311 (2005)<br></p>

<p>Applications Progesterone (P755900) metabolite.<br>References Christy H., et al.: J. Steroid Biochem., Mol., Biol., 116, 171 (2009), Peristera, O., et al.: Toxicol., Lett., 189, 219 (2009), Mori, T., et al.: Toxicol., Lett., 186, 123 (2009),<br></p>

<p>Applications An epimer of Pregnenolone (P712200), a GABAA antagonist and increases neurogenesis in the hippocampus.<br>References Li, W. et al.: J, Pharmacol. Exp. Therap., 323, 236 (2007); Sunol, C. et al.: J. Med. Chem., 49, 3225 (2006);<br></p>

<p>Applications Lynestrenol is an orally available progestogen hormone used in contraception to avoid hereditary angiodema as well as in treatment of ischemic stroke.<br>References Saule, C. et al.: Clin. Exp. Allergy, 43, 475 (2013); Beraki, S. et al.: PLoS One., 8, e69233 (2013);<br></p>

<p>Applications A synthetic progestational agent used in veterinary medicine for the control of estrus in mares.<br>References Machnik M. et al.: J. Vet. Phamacol. Therap., 30, 86 (2007); Goncalves dos Santos, J.M. et al.: Anim. Reprod. Sci., 84, 407 (2004);<br></p>

<p>Applications di(4-Hydroxy Atorvastatin-d5) Calcium Salt is a labeled metabolite of Atorvastatin Calcium Salt (A791750), a selective, competitive HMG-CoA reductase inhibitor. Atorvastatin is the only drug in its class specfically indicated for lowering both elevated LDL-cholesterol and triglycerides in patients with hypercholesterolemia.<br>References Kearney, A.S., et al.: Pharm. Res., 10, 1461 (1993); Heinonen, T.M., et al.: Clin. Ther., 18, 853 (1996); Whitfield, L.R., et al.: Eur. J. Drug Metab. Pharmacokinet., 25, 97 (2000)<br></p>

<p>Impurity Cholecalciferol EP Impurity E<br>Stability Light Sensitive, Temperature Sensitive, Unstable in DMSO<br>Applications Tachysterol3 (Cholecalciferol EP Impurity E) is a bioactive, synthetic vitamin D3 analog.<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 Bouillon, R., et al.: Endocr. Rev., 16, 200 (1995), Ettinger, R., et al.: Adv. Drug Res., 28, 269 (1996), Doi, T., et al.: Tetrahedr. Lett., 45, 5727 (2004),<br></p>

<p>Applications 11α-Hydroxy Canrenone is the key intermediate in the synthesis of Eplerenone, a cardiovascular drug. Canrenone was biotransformed into 11α-Hydroxycanrenone by Aspergillus ochraceus SIT34205.<br>References Luetscher, J., et al.: J. Clin. Invest., 29, 1576 (1950), Gaunt, R., et al.: J. Clin. Endocrinol. Metab., 15, 621 (1955), McMahon, E., et al.: Curr. Opin. Pharm., 1, 190 (2001), McMahon, E., et al.: Curr. Pharm. Des., 9, 1065 (2003),<br></p>

<p>(betaS,deltaS)-2-(4-Fluorophenyl)-beta,delta-dihydroxy-5- (1-methylethyl)-3-phenyl-4-[(phenylamino)carbonyl]-1H-pyrrole- 1-heptanoic acid calcium salt (2:1) is a fluorinated derivative of the natural metabolite 2-(4-fluorophenyl)-beta,delta-dihydroxy -5-(1 methylethyl)-3 phenyl 4-[(phenylamino)carbonyl]-1H pyrrole 1 heptanoic acid. It is an enantiomer of the racemate with optical purity &gt; 98%. The compound has been used as a pharmacological and supramolecular chemistry probe for assays and chemosensors.</p>

<p>Atorvastatin methyl ester is a statin drug that inhibits the synthesis of cholesterol and other lipids in the body. It is used to reduce high levels of low-density lipoprotein (LDL) cholesterol, which may lead to heart disease or stroke. Atorvastatin methyl ester has been shown to be effective in reducing the uptake of LDL cholesterol into cells by preventing the formation of LDL particles. This drug also decreases the production of biphosphate-containing phospholipids, which are essential for dendritic cell maturation. The crystalline polymorphs have been characterized by X-ray diffraction and microscopy. Impurities can be detected using ultraviolet spectroscopy, infrared spectroscopy, or nuclear magnetic resonance spectroscopy.</p>

<p>Soluble in Chloroform &amp; in Methanol Confirmed<br>Insoluble in Wate</p>

<p>Difluoro atorvastatin is a filtrate of atorvastatin, which is a cholesterol-lowering drug. It is synthesized by reacting butyric acid with atorvastatin in an organic solvent. The reaction solution was filtered to remove impurities and then purified by liquid chromatography. The product was characterized by diffraction and LC-MS analysis. Difluoro atorvastatin has a high purity and is suitable for further use in the preparation of pharmaceuticals.</p>

<p>Defluoro atorvastatin calcium is a bulk drug that has been approved to be used as an adjunct to diet to reduce elevated cholesterol levels in adults. Defluoro atorvastatin calcium is the desfluoro-enantiomer of atorvastatin, which is a statin that inhibits the enzyme HMG-CoA reductase. This enzyme catalyzes the conversion of HMG-CoA to mevalonic acid, which is an early step in the synthesis of cholesterol. The fluoro group on defluoro atorvastatin calcium is not expected to have any significant effect on its potency or metabolic pathways and any impurities are not expected to have any therapeutic effect.</p>

<p>7α-Hydroxyhydrocortisone</p>

<p>Soluble in Chloroform &amp; in Methanol Confirmed<br>Insoluble in Water</p>

<p>3-Oxo-4-aza-5a-androst-1-ene-17b-carboxylic acid is a covalently bonded prodrug that is metabolized to its active form, finasteride, in the body. It has been shown to have physiological activities such as skin permeation and cell growth. 3-Oxo-4-aza-5a-androst-1-ene 17b carboxylic acid also has immunotherapy properties and can be conjugated with other compounds for use in cancer treatment.</p>

<p>Fluoxetine is a selective serotonin reuptake inhibitor that is used to treat major depressive disorder, obsessive-compulsive disorder (OCD), bulimia nervosa, panic disorder, premenstrual dysphoric disorder (PMDD), and social anxiety disorder. It is also used as an appetite suppressant in some countries. Fluoxetine inhibits the neuronal uptake of serotonin by blocking the presynaptic transporter protein. The most common adverse effects are nausea, diarrhea, drowsiness, dry mouth, blurred vision and sexual dysfunction.</p>

<p>Fluticasone Propionate EP Impurity F is an impurity of Fluticasone Propionate. Fluticasone Propionate is a synthetic glucocorticoid used in the treatment of asthma and other allergic disorders. Impurity F is a metabolite of Fluticasone Propionate and has been detected in human plasma at low levels (5% of total fluticasone propionate). The metabolism of Fluticasone Propionate to Impurity F has been studied in rat, mouse, dog and man.<br>br&gt;br&gt;<br>The following table summarizes the metabolic pathways that have been identified for this impurity:<br>br&gt;br&gt;<br>Metabolism studies indicate that Impurity F is mainly metabolized by CYP3A4 to form conjugates with glucuronic acid or sulfates. It may also be hydrolyzed to form 5α-flurostan-3β,17β-d</p>

<p>Soluble in Chloroform &amp; in Methanol Confirmed<br>Insoluble in Water</p>

<p>Calcipotriol EP Impurity B is a drug product that is an impurity in Calcipotriol EP. It is produced during the synthesis of calcipotriol and may be present in the natural product. It has been shown to have anti-inflammatory properties, and can be used as a research tool to study calcipotriol metabolism.</p>

<p>Calcipotriol EP Impurity G is an impurity in calcipotriol, which is a drug product. Calcipotriol EP Impurity G has a CAS number of 126825-26-3 and is a natural metabolite of calcipotriol. It is also known as calcipotriol EP Impurity G or calcipotriol EPIG. It has been shown to be an analytical impurity in calcipotriol, and it has been detected by HPLC analysis. Calcipotriol EP Impurity G can be used for research and development, as well as for the production of pharmacopoeia standards.</p>

<p>O-Methyl atorvastatin calcium is a drug product that is an HPLC standard. It is a natural metabolite of atorvastatin, which is synthesized by cytochrome P450 3A4 in the liver. O-Methyl atorvastatin calcium has been shown to be an impurity in some batches of atorvastatin calcium. It has been observed to have pharmacological effects similar to those of atorvastatin. O-Methyl atorvastatin calcium has been used as a research and development (R&amp;D) tool for studies on the metabolism of drugs, including its own synthesis and the study of the effect on other drugs such as amiodarone.</p>

<p>Atorvastatin epoxy tetrahydrofuran impurity is a byproduct of the synthesis process. It is a white crystalline powder that is soluble in organic solvents and sparingly soluble in water. Atorvastatin epoxy tetrahydrofuran impurity has been shown to be an impurity of atorvastatin. It is not known to have any biological activity, but it may pose a health risk if present in large quantities.</p>

<p>Atorvastatin lactone is a prodrug for atorvastatin. It is an inhibitor of the enzyme HMG-CoA reductase, which is involved in cholesterol synthesis and reduces LDL cholesterol levels. Atorvastatin lactone is absorbed from the gut into the bloodstream and then converted to atorvastatin, which has a higher potency than atorvastatin lactone. This conversion occurs in the liver by cytochrome P450 enzymes, including cytochrome CYP3A4. The pharmacokinetics of atorvastatin lactone are influenced by drugs that inhibit these enzymes. Atorvastatin and its metabolites are excreted in human serum as glucuronide or sulfate conjugates.</p>

<p>Calcipotriol EP Impurity H is an impurity found in calcipotriol EP. It is a metabolite of calcipotriol EP, which is the active ingredient in Dovonex. Calcipotriol EP Impurity H can be detected by HPLC with a retention time of 11.5 minutes and its purity can be determined by UV spectroscopy at 254 nm with a purity of &gt;98%. Calcipotriol EP Impurity H can also be synthesized from natural or synthetic sources.</p>

<p>Desfluoro atorvastatin is a crystalline polymorph of atorvastatin that has been shown to have improved flowrate and dissolution profile compared with the conventional form. Desfluoro atorvastatin is synthesized by adding a fluorine atom to a specific position in the molecule. The synthesis procedure includes chromatographic purification and analysis of impurities, which are then eliminated by diode laser irradiation. Impurities may also be eliminated through hydrogenation or recrystallization.</p>

<p>Beta-Epoxyabiraterone acetate is a synthetic and natural metabolite of abiraterone that is used as an API impurity in the synthesis of abiraterone acetate. The drug product is a niche compound with CAS No. 52464-96-6. The Metabolite is an impurity found in the synthesis of beta-epoxyabiraterone acetate. Drug development research and development, analytical methods, and pharmacopoeia are all involved in the production of this compound.</p>

<p>Racemic 3-Oxo atorvastatin sodium salt (3OAS) is a drug product that has been tested in the laboratory and found to be suitable for further development. It is a natural substance that has not been chemically synthesized. Racemic 3-Oxo atorvastatin sodium salt is an impurity standard that can be used to establish the purity of API drugs. It can also be used as a metabolite in metabolism studies. Racemic 3-Oxo atorvastatin sodium salt is high purity and can be used for niche applications such as pharmacopoeia production.</p>

<p>Atorvastatin is a statin drug that inhibits the enzyme HMG-CoA reductase, which is responsible for cholesterol synthesis. Atorvastatin is used to lower LDL cholesterol and total cholesterol levels in the blood. It also lowers triglyceride levels and raises HDL cholesterol levels. Atorvastatin has been shown to inhibit fibrinogen production, reduce TNF-α production, and improve body mass index (BMI) in obese patients. This drug has been shown to be effective in reducing the size of atherosclerotic lesions by decreasing the amount of cholesteryl esters transferred from high-density lipoprotein (HDL) to low-density lipoprotein (LDL). It has also been shown to inhibit collagen production and stimulate muscle cell proliferation.</p>

<p>(3R,5S)-Atorvastatin sodium salt is a synthetic compound that is used in the treatment of high cholesterol. It belongs to the class of statins, which are used for lowering blood cholesterol levels. The drug product contains at least 99% by weight of (3R,5S)-atorvastatin sodium salt. This product also has an analytical purity greater than 98%. It is metabolized via oxidation and hydroxylation to form metabolites that exhibit pharmacological activity similar to the parent molecule. (3R,5S)-Atorvastatin sodium salt is a natural product that can be found in plants such as yew trees. This drug has been shown to have niche applications in drug development and research and development.</p>

<p>Atorvastatin is a drug product that is metabolized to atorvastatin epoxy pyrrolooxazin tricyclic impurity. Due to the presence of this impurity, the purity of the drug product is not 100%. Atorvastatin epoxy pyrrolooxazin tricyclic impurity is a natural metabolite with CAS number 516-80-1. It has been shown to have effects on metabolism and may be involved in the development of atherosclerosis. Metabolism studies have been conducted on animals, but not humans.</p>

<p>(5α)-17-(3-Pyridinyl)androst-16-en-3-one is a natural metabolite of testosterone that is produced in the liver. It has been identified as an impurity in API, which can be found in drugs used for the treatment of high blood pressure and prostate cancer. (5α)-17-(3-Pyridinyl)androst-16-en-3-one is not active as a drug itself, but it can be used as a standard to study the metabolism of testosterone and other steroids.</p>

<p>Calcipotriol EP Impurity E is a synthetic impurity that is found in the calcipotriol EP API. Calcipotriol EP Impurity E is an impurity standard for HPLC and can be used in drug development, research and development, and pharmacopoeia. It has been shown to have no significant effect on the pharmacological activity of calcipotriol EP.</p>

<p>Please enquire for more information about Defluoro atorvastatin acetonide tert-butyl ester including the price, delivery time and more detailed product information at the technical inquiry form on this page</p>

<p>Hydrocortisone 21-Aldehyde (Hydrate</p>

<p>Atorvastatin impurity F is an impurity that can be found in atorvastatin. It is a white to off-white crystalline solid with a melting point of 142°C. It has a molecular weight of 273.5 and chemical formula of C14H13N3O2. This impurity can be found in atorvastatin as an API impurity, which may have an effect on the efficacy or toxicity of the drug product. Impurities are present in all pharmaceutical products and should be identified, characterized, and quantified for quality control purposes. Impurities are often unavoidable byproducts of the manufacturing process and can lead to potential safety concerns if they are not detected early on during drug development. The presence of impurities may also affect the pharmacological effects or therapeutic efficacy of the drug product.</p>

<p>Soluble in Chloroform &amp; in Methanol Confirmed<br>Insoluble in Wate</p>