Betamethasone 21-acetate
Also known as: Betamethasone acetate, 9α-Fluoro-16β-methyl-11β,17α,21-trihydroxy-1,4-pregnadiene-3,20-dione 21-acetate, 21-Acetyloxy-9-fluoro-11β,17-dihydroxy-16β-methylpregna-1,4-diene-3,20-dione, Pregna-1,4-diene-3,20-dione, 21-(acetyloxy)-9-fluoro-11,17-dihydroxy-16-methyl-, (11β,16β)-
Betamethasone 21-acetate (CAS 987-24-6) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C24H31FO6 and a molecular weight of 434.498 g/mol. Key properties include a melting point of 200-220°C (dec.), a boiling point of 579.4±50.0 °C at 760 mmHg, a density of 1.3±0.1 g/cm3 and a flash point of 304.2±30.1 °C. It is classified under GHS with signal word Warning and hazard statements H351 — Suspected of causing cancer. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 987-24-6
- Jingsj CID
- J-37840-5
- Molecular Formula
- C24H31FO6
- Molecular Weight
- 434.498 g/mol
- Category
- Organic Acids
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | 200-220°C (dec.) |
|---|---|
| Boiling Point | 579.4±50.0 °C at 760 mmHg |
| Density | 1.3±0.1 g/cm3 |
| Flash Point | 304.2±30.1 °C |
| Exact Mass | 434.210480 |
| PSA | 100.90000 |
| LogP | 2.96 |
| Vapor Pressure | 0.0±3.6 mmHg at 25°C |
| Refractive Index | 1.571 |
| Storage Conditions | Refrigerator |
GHS Safety & Compliance
- H351 — Suspected of causing cancer
Activity & Biological Data
| Additional Information | [1]. Schmidt AF, et al. Low-dose betamethasone-acetate for fetal lung maturation in preterm sheep. Am J Obstet Gynecol. 2018 Jan;218(1):132.e1-132.e9. |
|---|
Frequently Asked Questions
What is the CAS number of Betamethasone 21-acetate?
The CAS number of Betamethasone 21-acetate is 987-24-6.
What are the molecular formula and molecular weight of Betamethasone 21-acetate?
Betamethasone 21-acetate has molecular formula C24H31FO6 and molecular weight 434.498 g/mol.
Is Betamethasone 21-acetate hazardous?
Betamethasone 21-acetate has GHS signal word Warning and hazard statements H351 — Suspected of causing cancer.
What are the upstream and downstream products of Betamethasone 21-acetate?
For Betamethasone 21-acetate, Upstream Products: 9β,11β-Epoxy-17,21-dihydroxy-16β-methylpregna-1,4-diene-3,20-dione 21-Acetate, Pregna-9(11),16-dien-20-one, 3-(acetyloxy)-, (3β,5α)-, (25R)-5α-Spirost-9(11)-en-3β-ol; Downstream Products: Betamethasone.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "Betamethasone 21-acetate (CAS 987-24-6)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-37840-5 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.