Back to catalogue
CorticosteroidsIn stockAPI reference standardPh. Eur.

Betamethasone 21- propionate

JR-ST1010-04

Variant ofBetamethasone Dipropionate EP CRS

Betamethasone 21-propionate (9-fluoro-11β,17-dihydroxy-16β-methyl-3,20-dioxopregna-1,4-dien-21-yl propanoate); C-21 monoester regioisomer and acyl-migration/hydrolysis impurity of betamethasone dipropionate.

Structure & identifiers

2D structure — select to enlarge

Catalogue code
JR-ST1010-04
Category
Corticosteroids
CAS number
75883-07-7
Grade
API reference standard
Pharmacopoeia
Ph. Eur.
Molecular formula
C25H33FO6
Molecular weight
448.53 g/mol
Pack sizes
25 mg · 50 mg · 100 mg · 500 mg
Record updated
12 Nov 2026

Chemical name

Betamethasone 21- propionate

SMILES

CCC(=O)OCC(=O)[C@@]1(O)[C@@H](C)C[C@H]2[C@@H]3CCC4=CC(=O)C=C[C@]4(C)[C@@]3(F)[C@@H](O)C[C@]12C

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.

Betamethasone 21- propionate

25 mg · ×1