IPC Main Group
C07J 51/00 Normal steroids with unmodified cyclopenta[a]hydrophenanthrene skeleton not provided for in groups
Introduced: July 1974
Last revised: January 2006
Classification Context
- Section:
- CHEMISTRY; METALLURGY
- Class:
- ORGANIC CHEMISTRY
- Subclass:
- STEROIDS
Related Keywords
18-NORSTEROIDS; 19-NORSTEROIDS