triphenylbromoethylene triphenylbromoethylene triphenylbromoethylene (tpbe; brand names bromylene, eitriphin, oestronyl, prostilban, tribenorm), also known as bromotriphenylethylene or as phenylstilbene bromide, is a synthetic nonsteroidal estrogen of the triphenylethylene group that was marketed in the 1940s similarly to the closely related estrogen triphenylchloroethylene. triphenylbromoethyleneclinical datatrade namesbromylene, eitriphin, oestronyl, prostilban, tribenormother namestpbe; tribromophenylethylene; bromotriphenylethylene; phenylstilbene bromide; fenbrostilbenumdrug classnonsteroidal estrogenidentifiers iupac name (1-bromo-2,2-diphenylethenyl)benzene cas number1607-57-4pubchem cid15354chemspider14615uniimrw5mko6lzcomptox dashboard (epa)dtxsid80166971 echa infocard100.015.029 chemical and physical dataformulac20h15brmolar mass335.244 g·mol−13d model (jsmol)interactive image smiles c1=cc=c(c=c1)c(=c(c2=cc=cc=c2)br)c3=cc=cc=c3 inchi inchi=1s/c20h15br/c21-20(18-14-8-3-9-15-18)19(16-10-4-1-5-11-16)17-12-6-2-7-13-17/h1-15hkey:vuqvjiubuppcdb-uhfffaoysa-n a diethoxylated derivative of triphenylbromoethylene, estrobin (dbe), is also an estrogen, but, in contrast, was never marketed. an ethylated derivative of triphenylbromoethylene, broparestrol (bdpe), is a selective estrogen receptor modulator (serm) that has been marketed.