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AntibioticsIn stockAPI reference standardUSP

Clarithromycin USP CRS

JR-AB1002

United States Pharmacopeia (USP) Reference Standard of Clarithromycin (6-O-methylerythromycin); semi-synthetic macrolide antibiotic API standard for compendial identification and assay.

Structure & identifiers

2D structure — select to enlarge

Catalogue code
JR-AB1002
Category
Antibiotics
CAS number
81103-11-9
Grade
API reference standard
Pharmacopoeia
USP
Molecular formula
C38H69NO13
Molecular weight
747.96 g/mol
Pack sizes
25 mg · 50 mg · 100 mg · 500 mg
Record updated
12 Nov 2026

Chemical name

Clarithromycin USP CRS

SMILES

CC[C@H]1OC(=O)[C@H](C)[C@@H](O[C@H]2C[C@@](C)(OC)[C@@H](O)[C@H](C)O2)[C@H](C)[C@@H](O[C@@H]3O[C@H](C)C[C@@H]([C@H]3O)N(C)C)[C@](C)(OC)C[C@@H](C)C(=O)[C@H](C)[C@@H](O)[C@]1(C)O

Compound identity, CAS number, formula and structure are referenced from public chemical databases. Contact us to confirm availability, pack sizes and documentation for your order.

Clarithromycin USP CRS

25 mg · ×1