MP-2001, also known as 2,3,4-trimethoxyestra-1,3,5(10)-trien-17ò-ol or 2,4-dimethoxyestradiol 3-methyl ether, is a steroid and derivative of estradiol that was described in 1966 and is devoid of estrogenic activity but produces potent analgesic effects in animals. It was never marketed.