Patent Document ID: 8580848
Application ID: 13489261
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 X is CR 4 , O, S or NR 4 atom, wherein R 4 is m is an integer of 0 or 1, Q is a phenyl group substituted with C 1 -C 3 alkyl group, halogen atom, or nitro group, and n is an integer of 0-9.