Wikipedia
Nilestriol
Nilestriol ( INN) (developmental code name LY-49825), also known as nylestriol ( USAN, BAN), is a synthetic, steroidal estrogen that was patented in 1971 and was never marketed. It is the 3-cyclopentyl ether of ethinyl estriol, and is also known as ethinyl estriol cyclopentyl ether (EE3CPE). Nilestriol is a prodrug of ethinyl estriol, and is a more potent estrogen in comparison. It is described as a slowly- metabolized, long-acting estrogen and derivative of estriol.