Wikipedia
Doisynoestrol
Doisynoestrol (brand names Fenocyclin, Surestrine, Surestryl; former developmental code name RS-2874), also known as fenocycline, as well as cis-bisdehydrodoisynolic acid methyl ether (BDDA ME), is a synthetic, non-steroidal estrogen of the doisynolic acid group that is no longer marketed. It is the methyl ether of bisdehydrodoisynolic acid.