clomifenoxide clomifenoxide clomifenoxide (inn), also known as clomifene n-oxide, is a nonsteroidal selective estrogen receptor modulator (serm) of the triphenylethylene group that is described as an antiestrogen and "gonad stimulant" and was never marketed. it is an active metabolite of clomifene. clomifenoxideclinical dataother namesclomifene n-oxideidentifiers iupac name (e,z)-2-(p-(2-chloro-1,2-diphenylvinyl)phenoxy)triethylamine n-oxide cas number97642-74-5pubchem cid9979613chemspider8155205uniil88w2zr0tichemical and physical dataformulac26h28clno2molar mass421.97 g·mol−13d model (jsmol)interactive image smiles (ccoc1ccc(cc1)c(=c(/c1ccccc1)cl)\c1ccccc1)(cc)(cc) inchi inchi=1s/c26h28clno2/c1-3-28(29,4-2)19-20-30-24-17-15-22(16-18-24)25(21-11-7-5-8-12-21)26(27)23-13-9-6-10-14-23/h5-18h,3-4,19-20h2,1-2h3/b26-25-key:pghwczitrqnipm-qplcgjkrsa-n