Patent ID: 6638923
Filing Date: 2003-10-28
Classification: A61P,C07J

Abstract:
An estra-1,3,5(10),16-tetraene derivative represented by formula (I): wherein R1 represents alkoxy (the alkyl moiety of said alkoxy is straight-chain alkyl having 1, 2, or 4-14 carbon atoms or branched-chain alkyl having 1 to 14 carbon atoms), or NR2R3 (wherein R2 and R3 are the same or different, and each represents hydrogen, straight-chain lower alkyl having 1 to 3 carbon atoms, or branched-chain lower alkyl having 3 to 8 carbon atoms, with the proviso that when one of R2 and R3 is hydrogen, the other is not CH2CH2CH3, CH2CH(CH3)2, or C(CH3)3), or a pharmaceutically acceptable salt thereof.