| pregnene | An unsaturated steroid of primarily terminological importance; utilised in systematic nomenclature of appropriate 21-carbon steroids. (05 Mar 2000) |
|---|---|
| pregnenediones | Unsaturated pregnane derivatives containing two keto groups on side chains or ring structures. (12 Dec 1998) |
| pregnenes | Unsaturated derivatives of pregnanes. (12 Dec 1998) |