N-t-butyl-androst-3,5-diene-17.beta.-carboxamide-3-carboxylic acid polymorph A
US5596109A · kind A · utility
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Key dates
| Filing date | Dec 2, 1994 |
| Grant date | Jan 21, 1997 |
| Priority date | — |
| Expiry date | Dec 2, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07J41/0066
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The invention describes a process for the preparation of the polymorph A form of a compound having the structure ##STR1## which involves triturating, crystallizing, or precipitating crude N-t-butyl-androst-3,5-diene-17.beta.-carboxamide-3-carboxylic acid from an ethyl acetate or t-butyl methyl ether solvent, followed by isolation of the polymorph A.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.