doisynoestrol doisynoestrol doisynoestrol (brand names fenocyclin, surestrine, surestryl; former developmental code name rs-2874), also known as fenocycline, as well as cis-bisdehydrodoisynolic acid 7-methyl ether (bdda me), is a synthetic nonsteroidal estrogen of the doisynolic acid group that is no longer marketed. it is a methyl ether of bisdehydrodoisynolic acid. doisynoestrol was described in the literature in 1945. it has about 0.02% of the relative binding affinity of estradiol for the estrogen receptor. doisynoestrolclinical datatrade namesfenocyclin, surestrine, surestrylother namesdiosynestrol; fenocycline; fenocyclin; phenocyclin; rs-2874; dehydrofolliculinic acid; cis-bisdehydrodoisynolic acid 7-methyl ether; bdda me; nsc-56846; nsc-122041routes ofadministrationby mouthdrug classnonsteroidal estrogenidentifiers iupac name 1-ethyl-7-methoxy-2-methyl-3,4-dihydro-1h-phenanthrene-2-carboxylic acid cas number15372-34-6pubchem cid97911chemspider88384unii2o436bjq6tcomptox dashboard (epa)dtxsid4022496 chemical and physical dataformulac19h22o3molar mass298.382 g·mol−13d model (jsmol)interactive image smiles ccc1c2=c(ccc1(c)c(=o)o)c3=c(c=c2)c=c(c=c3)oc inchi inchi=1s/c19h22o3/c1-4-17-16-7-5-12-11-13(22-3)6-8-14(12)15(16)9-10-19(17,2)18(20)21/h5-8,11,17h,4,9-10h2,1-3h3,(h,20,21)key:hzzsxuiueswvss-uhfffaoysa-n