Allopregnanolone
Also known as: 3β-hydroxy-5α-pregnan-20-one, Tetrahydroprogesterone, 5α-Pregnan-3β-ol-20-one, Allopregnan-3β-ol-20-one, 3β-allopregnanolone, Epi-allopregnanolone, Isopregnanolone
Allopregnanolone (CAS 516-55-2) is a compound in the Alcohols category listed in the Jingsj chemical database. It has the molecular formula C21H34O2 and a molecular weight of 318.49300 g/mol. Key properties include a melting point of 200℃, a boiling point of 431.2ºC at 760mmHg, a density of 1.053g/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.
- 516-55-2
- Jingsj CID
- J-13014-9
- Molecular Formula
- C21H34O2
- Molecular Weight
- 318.49300 g/mol
- Category
- Alcohols
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | 200℃ |
|---|---|
| Boiling Point | 431.2ºC at 760mmHg |
| Density | 1.053g/cm3 |
| Flash Point | 183.9ºC |
| Exact Mass | 318.25600 |
| PSA | 37.30000 |
| LogP | 4.59520 |
| Refractive Index | 1.524 |
Activity & Biological Data
| Target | Human Endogenous Metabolite |
|---|---|
| Additional Information | [1]. Debatin T, et al. Effect of isopregnanolone on rapid tolerance to the anxiolytic effect of ethanol. Rev Bras Psiquiatr. 2006 Mar;28(1):18-23. |
Frequently Asked Questions
What is the CAS number of Allopregnanolone?
The CAS number of Allopregnanolone is 516-55-2.
What are the molecular formula and molecular weight of Allopregnanolone?
Allopregnanolone has molecular formula C21H34O2 and molecular weight 318.49300 g/mol.
What are the upstream and downstream products of Allopregnanolone?
For Allopregnanolone, Upstream Products: Pregnenolone, 16-Dehydropregnenolone, 16-Dehydropregnenolone Acetate; Downstream Products: 3α,21-dihydroxy-5α-pregnan-20-one, Epiandrosterone, 5α-Dihydroprogesterone.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "Allopregnanolone (CAS 516-55-2)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-13014-9 (accessed 2026-11-06).
Data for reference only; verify product details with suppliers before purchase.