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CorticosteroidsIn stockImpurity reference standardPh. Eur.

Methylprednisolone Acetate EP Impurity A

JR-ST1004-01

Variant ofMethylprednisolone Acetate EP CRS

Mixture of C-20 epimers (20R and 20S diastereomers: (20R/20S)-11β,17,20-trihydroxy-6α-methyl-3-oxopregna-1,4-dien-21-yl acetate); 20-dihydro reduction impurity of methylprednisolone acetate used for EP related substances analysis.

Structure & identifiers

2D structure — select to enlarge

Catalogue code
JR-ST1004-01
Category
Corticosteroids
CAS number
93963-74-7
Grade
Impurity reference standard
Pharmacopoeia
Ph. Eur.
Molecular formula
C24H34O6
Molecular weight
418.53 g/mol
Pack sizes
25 mg · 50 mg · 100 mg · 500 mg
Record updated
12 Nov 2026

Chemical name

Methylprednisolone Acetate EP Impurity A

SMILES

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

Methylprednisolone Acetate EP Impurity A

25 mg · ×1