Patent Document ID: 8507553
Application ID: 13489270
Patent Flag: 1

Claim One:
1. A compound represented by general formula (I), or a pharmaceutically acceptable salt thereof: wherein R 1 is a hydrogen atom, C 1 -C 6 alkyl group, C 2 -C 6 alkyl ketone group or —(CH 2 ) n -Q, of which Q is an ether group or amine group substituted with C 1 -C 6 lower alkyl group; R 2 is a hydrogen atom, or an ether group or thio group substituted with C 1 -C 6 alkyl group; R 3 is wherein R′″ is a hydrogen atom, C 1 -C 6 alkyl group, or benzyl group, n is an integer of 0-9: and wherein when R 1 is CH 3 , R 3 is Ib, n is 2 and R′″ is methyl; R 2 is not SCH 3 or hydrogen.