Estradiol 17β-benzoate

Estradiol 17β-benzoate
Clinical data
Other names	E2-17B; ZYC30
Drug class	Estrogen; Estrogen ester
Identifiers
	IUPAC name [(8R,9S,13S,14S,17S)-3-hydroxy-13-methyl-6,7,8,9,11,12,14,15,16,17-decahydrocyclopenta[a]phenanthren-17-yl] benzoate;
CAS Number	983-30-2;
PubChem CID	66420;
ChemSpider	59794;
UNII	3GFX41Z289;
CompTox Dashboard (EPA)	DTXSID90243545 ;
Chemical and physical data
Formula	C25H28O3
Molar mass	376.496 g·mol−1
3D model (JSmol)	Interactive image;
	SMILES C[C@]12CC[C@H]3[C@H]([C@@H]1CC[C@@H]2OC(=O)C4=CC=CC=C4)CCC5=C3C=CC(=C5)O;
	InChI InChI=1S/C25H28O3/c1-25-14-13-20-19-10-8-18(26)15-17(19)7-9-21(20)22(25)11-12-23(25)28-24(27)16-5-3-2-4-6-16/h2-6,8,10,15,20-23,26H,7,9,11-14H2,1H3/t20-,21-,22+,23+,25+/m1/s1; Key:AAGOOGMSOHOVSE-BZDYCCQFSA-N;

Estradiol 17β-benzoate (E2-17B) is an estrogen and an estrogen ester—specifically, the C17β benzoate ester of estradiol—which was never marketed. It is the C17β positional isomer of the better-known and clinically used estradiol ester estradiol benzoate (estradiol 3-benzoate; Progynon-B). Estradiol 17β-benzoate was first described in the 1930s.