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What is "pregnene"

Wiktionary
pregnene

n. (context organic chemistry English) Any derivative of pregnane having a double bond in the A-ring

Wikipedia
Pregnene

A pregnene is an alkene derivative of a pregnane.

An example is cortisone.

Image:Cortison.svg| Cortisone
Image:Ethisterone.png| Ethisterone
Image:Spironolacton.svg| Spironolactone