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CorticosteroidsIn stockImpurity reference standardPh. Eur.

Dexamethasone EP Impurity D (Dexamethasone 9,11-epoxide)

JR-ST1007-05

Variant ofDexamethasone EP CRS

Dexamethasone 9,11-epoxide (9β,11β-epoxy-17,21-dihydroxy-16α-methylpregna-1,4-diene-3,20-dione); synthetic intermediate and dehydrofluorination impurity of dexamethasone (EP Impurity D).

Structure & identifiers

2D structure — select to enlarge

Catalogue code
JR-ST1007-05
Category
Corticosteroids
CAS number
24916-90-3
Grade
Impurity reference standard
Pharmacopoeia
Ph. Eur.
Molecular formula
C22H28O5
Molecular weight
372.46 g/mol
Pack sizes
25 mg · 50 mg · 100 mg · 500 mg
Record updated
12 Nov 2026

Chemical name

Dexamethasone EP Impurity D (Dexamethasone 9,11-epoxide)

SMILES

C[C@H]1C[C@H]2[C@@H]3CCC4=CC(=O)C=C[C@]4(C)[C@]53O[C@@H]5C[C@]2(C)[C@@]1(O)C(=O)CO

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.

Dexamethasone EP Impurity D (Dexamethasone 9,11-epoxide)

25 mg · ×1