Pregnadiene

A pregnadiene is a diene derivative of a pregnane.[1]

Dienes have two double bonds. The first is usually between carbon 4 and carbon 5 on ring A.

6-ene

The second can be between carbons 6 and 7 on ring B:

Chlormadinone acetate (progestin)
Cyproterone acetate (antiandrogen)
Dydrogesterone (progestin)
Megestrol acetate (progestin, antineoplastic, appetite stimulant)
Canrenone (aldosterone antagonist)
Medrogestone (progestin)

1-ene

The second can also be between carbons 1 and 2 on ring A:

References

Pregnadienes at the U.S. National Library of Medicine Medical Subject Headings (MeSH)

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