Betamethasone (alcohol free)

JR-ST1009-01

Variant ofBetamethasone EP CRS

Betamethasone unesterified free alcohol (9-fluoro-11β,17,21-trihydroxy-16β-methylpregna-1,4-diene-3,20-dione); parent corticosteroid standard used as API reference and hydrolysis impurity marker for betamethasone esters.

Structure & identifiers

2D structure — select to enlarge

Catalogue code

JR-ST1009-01

Category

Corticosteroids

CAS number

378-44-9

Grade

API reference standard

Pharmacopoeia

Ph. Eur.

Molecular formula

C22H29FO5

Molecular weight

392.47 g/mol

Pack sizes

25 mg · 50 mg · 100 mg · 500 mg

Record updated

12 Nov 2026

Chemical name

Betamethasone (alcohol free)

SMILES

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