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CorticosteroidsIn stockImpurity reference standardPh. Eur.

Fluorometholone 9,11-epoxide

JR-ST1017-03

Variant ofFluorometholone Acetate USP CRS

Epoxy Metradiene / Fluorometholone EP Impurity D (9β,11β-epoxy-17-hydroxy-6α-methylpregna-1,4-diene-3,20-dione); synthetic intermediate and dehydrofluorination impurity of fluorometholone.

Structure & identifiers

2D structure — select to enlarge

Catalogue code
JR-ST1017-03
Category
Corticosteroids
CAS number
83873-16-9
Grade
Impurity reference standard
Pharmacopoeia
Ph. Eur.
Molecular formula
C22H28O4
Molecular weight
356.46 g/mol
Pack sizes
25 mg · 50 mg · 100 mg · 500 mg
Record updated
12 Nov 2026

Chemical name

Fluorometholone 9,11-epoxide

SMILES

CC(=O)[C@@]1(O)CC[C@H]2[C@@H]3C[C@H](C)C4=CC(=O)C=C[C@]4(C)[C@]53O[C@@H]5C[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.

Fluorometholone 9,11-epoxide

25 mg · ×1