Drug Impurity Standards

Milbemycin A3 (Standard) is the analytical standard of Milbemycin A3 (HY-130423). This product is intended for research and analytical applications. Milbemycin A3 is a 16-membered macrocyclic lactone compound found in the soil bacterium Saccharopolyspora hygroscopicus subsp. aureolacrimosus. Milbemycin A3 enhances the opening of glutamate- and GABA-gated chloride channels and exhibits insecticidal activity. Milbemycin A3 can be used in insect resistance-related research.

16-Epiestriol (Standard) is the analytical standard of 16-Epiestriol (HY-130046). This product is intended for research and analytical applications. 16-Epiestriol (16-epi-Estriol; 16β,17β-Estriol) is a natural stereoisomer of estriol and an anti-inflammatory agent that targets UGT. The Ki values of 16-Epiestriol against human UGT1A10 and UGT2B7 are 98.1 μM and 162 μM, respectively. As a glucuronidation substrate, 16-Epiestriol can be modified at the 3-OH, 16-OH and 17-OH sites by various UGT enzymes; in liver microsomes, the modification mainly occurs at the 16-OH and 17-OH sites, while reactions take place at all three sites in intestinal microsomes. 16-Epiestriol acts on the phase II inflammatory process by blocking edema mediated by prostaglandins and leukocyte infiltration. It lacks glycogenic activity or any effect on blood glucose levels, and serves as an important candidate molecule in the research of inflammatory diseases.

4-Methyl erlotinib (Standard) is the analytical standard of 4-Methyl erlotinib. This product is intended for research and analytical applications. 4-Methyl erlotinib, is a potent and selective epidermal growth factor receptor (EGFR) tyrosine kinase inhibitor. 4-Methyl erlotinib potently inhibits EGF-mediated tumor cell mitosis by reducing EGFr-specific tyrosine phosphorylation. Using a mouse model of human tumor transplantation, 4-Methyl erlotinib demonstrated significant and sustained suppression of EGFr phosphotyrosine levels, resulting in significant growth inhibition of EGFr-dependent human cancers.

N-Desethyl amodiaquine dihydrochloride (Standard) is the analytical standard of N-Desethyl amodiaquine dihydrochloride. This product is intended for research and analytical applications. N-Desethyl amodiaquine dihydrochloride is the biologically active metabolite of Amodiaquine (HY-B1322A). N-Desethyl amodiaquine dihydrochloride is an antiparasitic agent, has inhibitory for strains V1/S and 3D7 with IC50 values of 97 nM and 25 nM, respectively. N-Desethyl amodiaquine dihydrochloride can be used for the research of malaria.

Albendazole sulfoxide (Standard) is the analytical standard of Albendazole sulfoxide. This product is intended for research and analytical applications. Albendazole sulfoxide (Ricobendazole), the main active metabolite of Albendazole, exhibits anti-parasite effect against Echinococcus multilocularis Metacestodes.

Losartan Carboxylic Acid (Standard) is the analytical standard of Losartan Carboxylic Acid. This product is intended for research and analytical applications. Losartan Carboxylic Acid (E-3174), an active carboxylic acid metabolite of Losartan, is an angiotensin II receptor type 1 (AT1) antagonist. The Ki values are 0.97, 0.57, 0.67 nM for rat AT1B/AT1A and human AT1, respectively. Losartan Carboxylic Acid blocks the angiotensin II-induced responses in vascular smoothmuscle cells (VSMC). Losartan Carboxylic Acid elevates plasma renin activities and reduces mean arterial pressure[4].

5-Hydroxyomeprazole (Standard) is the analytical standard of 5-Hydroxyomeprazole. This product is intended for research and analytical applications. 5-Hydroxyomeprazole is the major metabolite of Omeprazole (HY-B0113).

Desacetylcefotaxime (Standard) is the analytical standard of Desacetylcefotaxime. This product is intended for research and analytical applications. Desacetylcefotaxime, the in vivo metabolite of Cefotaxime (CTX), possesses significant in vitro antimicrobial activity similar to the parent compound against a variety of aerobic and anaerobic bacteria.

Lodenafil (Standard) is the analytical standard of Lodenafil. This product is intended for research and analytical applications. Lodenafil is a potent phosphodiesterase type 5 (PDE5) inhibitor for the treatment of erectile dysfunction (ED).

Erythromycin A enol ether (Standard) is the analytical standard of Erythromycin A enol ether. This product is intended for research and analytical applications. Erythromycin A enol ether is an acidic degradation product of Erythromycin A (macrolide antibiotic) and has no antibacterial effect.

Ornidazole diol (Standard) is an analytical standard for Ornidazole diol. This product is used for research and analytical applications. Ornidazole diol (Ro 11-2616) is the diol of Ornidazole (HY-B0508) which is rapidly hydrolyzed in alkaline solution. Ornidazole (Ro 7-0207) is a 5-nitroimidazole derivative that is antiprotozoan and anaerobic.

Hydrocortisone aceponate (Hydrocortisone 17-propionate 21-acetate) Standard is the analytical standard of Hydrocortisone aceponate (HY-116691). This product is intended for research and analytical applications. Hydrocortisone aceponate (Hydrocortisone 17-propionate 21-acetate) is a diester-based topical glucocorticoid. Hydrocortisone aceponate alleviates symptoms such as erythema, dryness/desquamation, pruritus, epidermal exfoliation, and exudation/crusting. Hydrocortisone aceponate causes extremely few adverse reactions. Hydrocortisone aceponate is applicable to various dermatological disease studies.

Cetirizine Impurity D (Standard) is the analytical standard of Cetirizine Impurity D. This product is intended for research and analytical applications. Cetirizine Impurity D is an impurity of Cetirizine. Cetirizine, a second-generation antihistamine, is a specific, orally active and long-acting histamine H1-receptor antagonist. Cetirizine marks antiallergic properties and inhibits eosinophil chemotaxis during the allergic response.

meta-Fexofenadine (Standard) is the analytical standard of meta-Fexofenadine. This product is intended for research and analytical applications. meta-Fexofenadine (meta-MDL-16455) is an impurity of Fexofenadine. Fexofenadine, a H1R antagonist, is an anti-allergic agent used in seasonal allergic rhinitis and chronic idiopathic urticarial.

Fluazinam impurity 1 (Standard) is the analytical standard of Fluazinam impurity 1. This product is intended for research and analytical applications. Fluazinam impurity 1 is an impurity of Fluazinam with antifungal activity. Fluazinam impurity 1 is active against Sphaerotheca fuliginea, Pyricularia oryzae and Rhizoctonia solani.

Saccharin (Standard) is the analytical standard of Saccharin. This product is intended for research and analytical applications. Saccharin is an orally active, non-caloric artificial sweeteners (NAS). Saccharin has bacteriostatic and microbiome-modulating properties.

Benzarone (Standard) is the analytical standard of Benzarone. This product is intended for research and analytical applications. Benzarone is a potent human uric acid transporter 1 (hURAT1) inhibitor, with an IC₅₀ of 2.8 μM in oocyte. Benzarone could lower uric acid serum levels.

Benzyl acetate (Standard) is the analytical standard of Benzyl acetate (HY-N7124). This product is intended for research and analytical applications. Benzyl acetate is an aromatic ester with a jasmine scent. Benzyl acetate found in plants and is commonly used as a base fragrance ingredient in perfumes, cosmetics, and soap fragrances. Benzyl acetate is also one of the largest varieties in the synthetic fragrance industry.

Oseltamivir acid (Standard) is the analytical standard of Oseltamivir acid. This product is intended for research and analytical applications. Oseltamivir acid (GS 4071), the active metabolite of Oseltamivir phosphate, is an orally bioavailable, potent and selective inhibitor of influenza virus neuraminidase (IC₅₀=2 nM) with activity against both influenza A and B viruses.

D-(-)-Mandelic acid (Standard) is the analytical standard of D-(-)-Mandelic acid. This product is intended for research and analytical applications. D-(-)-Mandelic acid is an orally active alpha hydroxycarboxylic acid that can be isolated from bitter almonds and Indian chestnut trees. It has antioxidant and antibacterial properties and is expected to play an important role in the treatment of rheumatoid arthritis.