estrobin estrobin estrobin, also known as α,α-di(p-ethoxyphenyl)-β-phenylbromoethylene and commonly abbreviated as dbe, is a synthetic, nonsteroidal estrogen of the triphenylethylene group that was never marketed. chlorotrianisene, and subsequently clomifene and tamoxifen, were derived from it. estrobin, similarly to other triphenylethylenes, is very lipophilic and hence very long-lasting in its duration of action. similarly to chlorotrianisene, estrobin behaves a prodrug to a much more potent estrogen in the body. estrobinclinical dataatc codenoneidentifiers iupac name 1,1'-(2-bromo-2-phenyl-1,1-ethenediyl)bis(4-ethoxybenzene) cas number60883-74-1 ypubchem cid109030chemspider98048uniimm7v5zuu9bcomptox dashboard (epa)dtxsid30209726 chemical and physical dataformulac24h23bro2molar mass423.350 g·mol−1