8,9-dehydroestradiol 8,9-dehydroestradiol 8,9-dehydroestradiol, or δ8-17β-estradiol, also known as estra-1,3,5(10),8-tetraen-17β-ol-3-one, is a naturally occurring steroidal estrogen found in horses which is closely related to equilin, equilenin, and estradiol, and, as the 3-sulfate ester sodium salt, is a minor constituent of conjugated estrogens (premarin). it is also an important active metabolite of 8,9-dehydroestrone, analogously to conversion of estrone or estrone sulfate into estradiol. 8,9-dehydroestradiolclinical dataother namesδ8-estradiol; δ8-17β-estradiol; estra-1,3,5(10),8-tetraen-17β-ol-3-oneroutes ofadministrationby mouthdrug classestrogenidentifiers iupac name (13s,14s,17s)-13-methyl-6,7,11,12,14,15,16,17-octahydrocyclopentaphenanthrene-3,17-diol cas number23392-54-3chemspider8014038chemical and physical dataformulac18h22o2molar mass270.372 g·mol−13d model (jsmol)interactive image smiles oc4cc3c(/c1=c(/2cc(o)2(cc1)c)cc3)cc4 inchi inchi=inchi=1s/c18h22o2/c1-18-9-8-14-13-5-3-12(19)10-11(13)2-4-15(14)16(18)6-7-17(18)20/h3,5,10,16-17,19-20h,2,4,6-9h2,1h3/t16-,17-,18-/m0/s1key:uwydusmqfltkbq-bzsnnmdcsa-n