Etynodiol

Etynodiol, or ethynodiol, is a steroidal progestin of the 19-nortestosterone group which was never marketed. A diacylated derivative, etynodiol diacetate, is used as a hormonal contraceptive. "Etynodiol" is sometimes used as a synonym for "etynodiol diacetate".
It was patented in 1955.
Pharmacology.
Etynodiol is a prodrug of norethisterone, and is converted immediately and completely into norethisterone. Etynodiol is an intermediate in the conversion of the prodrug lynestrenol into norethisterone.
Chemistry.
Etynodiol is a 19-nortestosterone derivative. Structurally, it is almost identical to norethisterone and lynestrenol, differing only in its C3 substituent. Whereas norethisterone has a ketone at C3 and lynestrenol has no substituent at C3, etynodiol has a hydroxyl group at the position.
Society and culture.
Generic names.
"Etynodiol" is the generic name of the drug and its , while "ethynodiol" is its .