carbestrol carbestrol carbestrol (developmental code names nsc-19962, orf-2166) is a synthetic, nonsteroidal estrogen of the cyclohexenecarboxylic acid group and seco analogue of doisynolic acid that was described in the literature in 1956 and developed for the treatment of prostate cancer in the 1960s but was never marketed. carbestrolclinical dataother namesnsc-19962; orf-2166atc codenoneidentifiers iupac name 3-ethyl-4-(4-methoxyphenyl)-2-methylcyclohex-3-ene-1-carboxylic acid cas number1755-52-8pubchem cid15644chemspider14881uniic85ai8sochcomptox dashboard (epa)dtxsid70938669 chemical and physical dataformulac17h22o3molar mass274.360 g·mol−13d model (jsmol)interactive image smiles ccc1=c(ccc(c1c)c(=o)o)c2=cc=c(c=c2)oc inchi inchi=1s/c17h22o3/c1-4-14-11(2)15(17(18)19)9-10-16(14)12-5-7-13(20-3)8-6-12/h5-8,11,15h,4,9-10h2,1-3h3,(h,18,19)key:vjkvhuzovawkeb-uhfffaoysa-n