(7α)-21-[4-[(Diethylamino)methyl]-2-methoxyphenoxy]-7-methyl-19-norpregna-1,3,5(10)-trien-3-ol 2-Hydroxy-1,2,3-propanetricarboxylate Salt (1:1) is a reactant for the preparation of TAS-108, a novel steroidal antiestrogen that exhibits antitumor activity against tamoxifen-resistant breast cancer cell lines.
