[Trilostane (above) is explicitly not captured by this clause]
17-Hydroxyandrostan-3-one
17-Hydroxyestran-3-one
Effective 1 Sep 1996, S.I. 1996/1300 added:
1(c)
Any compound (not being Trilostane or a compound for the time being specified in sub-paragraph (b) above) structurally derived from 17-Hydroxyandrostan-3-one or from 17-Hydroxyestran-3-one by modification in any of the following ways, that is to say:
- by further substitution at position 17 by a methyl or ethyl group;
- by substitution to any extent at one or more of the positions 1, 2, 4, 6, 7, 9, 11 or 16, but at no other position;
- by unsaturation in the carbocyclic ring system to any extent, provided that there are no more than two ethylenic bonds in any one carbocyclic ring;
- by fusion of ring A with a heterocyclic system.
11 March 2016 · 
· Isomer Design
· Isomer Design