<unk>  is an estrogen. It is a seco-analogue of bisdehydrodoisynolic acid.  Vallestril was a brand of<unk>  issued by G. D. Searle & Company in the 1950s.
Methallenestril
Eluxadoline
Cobicistat
Iofendylate
Linopirdine
Ganirelix
Lixisenatide
Migalastat