Nilestriol
Nilestriol
Chemical compound
Nilestriol (INN ) (brand name Wei Ni An; developmental code name LY-49825), also known as nylestriol (USAN , BAN ), is a synthetic estrogen which was patented in 1971[1] and is marketed in China.[2][3] It is the 3-cyclopentyl ether of ethinylestriol, and is also known as ethinylestriol cyclopentyl ether (EE3CPE).[4] Nilestriol is a prodrug of ethinylestriol, and is a more potent estrogen in comparison.[4] It is described as a slowly-metabolized, long-acting estrogen and derivative of estriol.[5][6] Nilestriol was assessed in combination with levonorgestrel for the potential treatment of postmenopausal osteoporosis, but this formulation ultimately was not marketed.[7]