Betamethasone Sodium Phosphate EP CRS

JR-ST1006

European Pharmacopoeia (EP) Chemical Reference Substance of Betamethasone sodium phosphate (disodium 9-fluoro-11β,17-dihydroxy-16β-methyl-3,20-dioxopregna-1,4-dien-21-yl phosphate); corticosteroid API standard for assay and identification.

Structure & identifiers

2D structure — select to enlarge

Catalogue code

JR-ST1006

Category

Corticosteroids

CAS number

151-73-5

Grade

API reference standard

Pharmacopoeia

Ph. Eur.

Molecular formula

C22H28FNa2O8P

Molecular weight

516.41 g/mol

Pack sizes

25 mg · 50 mg · 100 mg · 500 mg

Record updated

12 Nov 2026

Chemical name

Betamethasone Sodium Phosphate EP CRS

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)COP(=O)([O-])[O-].[Na+].[Na+]