Etynodiol

Etynodiol
Clinical data
Other names	Ethynodiol; 3β-Hydroxynorethisterone; 17α-Ethynylestr-4-ene-3β,17β-diol
Drug class	Progestin; Progestogen
ATC code	G03DC06 (WHO) ;
Identifiers
	IUPAC name (3S,8R,9S,10R,13S,14S,17R)-17-ethynyl-13-methyl-2,3,6,7,8,9,10,11,12,14,15,16-dodecahydro-1H-cyclopenta[a]phenanthrene-3,17-diol;
CAS Number	1231-93-2;
ChemSpider	14017;
UNII	9E01C36A9S;
CompTox Dashboard (EPA)	DTXSID1023025 ;
ECHA InfoCard	100.013.610
Chemical and physical data
Formula	C20H28O2
Molar mass	300.442 g·mol−1
3D model (JSmol)	Interactive image;
	SMILES O[C@@H]4/C=C3\[C@@H]([C@H]2CC[C@]1([C@@H](CC[C@]1(C#C)O)[C@@H]2CC3)C)CC4;
	InChI InChI=1S/C20H28O2/c1-3-20(22)11-9-18-17-6-4-13-12-14(21)5-7-15(13)16(17)8-10-19(18,20)2/h1,12,14-18,21-22H,4-11H2,2H3/t14-,15-,16+,17+,18-,19-,20-/m0/s1; Key:JYILPERKVHXLNF-QMNUTNMBSA-N;

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.