Epipregnanolone

Also known as: 1-[(3S,5R,8R,9S,10S,13R,14S,17S)-3-hydroxy-10,13-dimethyl-2,3,4,5,6,7,8,9,11,12,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-17-yl]ethanone, 3-BETA-HYDROXY-5-BETA-PREGNAN-20-ONE, 3-BETA-HYDROXY-5-BETA-TETRAHYDROPROGESTERONE, 3.β.-Hydroxy-5.β.-tetrahydroprogesterone, 3alpha-hydroxy-5beta-pregnan-20-one, 3beta-hydroxy-5beta-pregnan-20-one, 3β-hydroxy-5β-pregnan-20-one, 5-BETA-PREGNAN-3-BETA-OL-20-ONE, 5B-pregnan-3B-ol-20-one crystalline, EPIPREGNANOLONE, PREGNANOLONE, Pregnan-20-one,3-hydroxy-, (3b,5b)-

Epipregnanolone (CAS 128-21-2) is a compound in the Organic Compounds category listed in the Jingsj chemical database. It has the molecular formula C21H34O2 and a molecular weight of 318.49300 g/mol. It is also known as 1-[(3S,5R,8R,9S,10S,13R,14S,17S)-3-hydroxy-10,13-dimethyl-2,3,4,5,6,7,8,9,11,12,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-17-yl]ethanone, 3-BETA-HYDROXY-5-BETA-PREGNAN-20-ONE and 3-BETA-HYDROXY-5-BETA-TETRAHYDROPROGESTERONE. Key properties include a boiling point of 431.2ºC at 760 mmHg, a density of 1.053 g/cm3 and a flash point of 183.9ºC. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.

128-21-2

Jingsj CID

J-1975060-8

Molecular Formula

C₂₁H₃₄O₂

Molecular Weight

318.49300 g/mol

Category

Organic Compounds

Last updated

8/21/2026