Patent ID: 7790884

Claim:
A compound represented by a formula (I) or a pharmaceutically acceptable salt thereof symbols in the formula represent the following meanings; A: single bond or C 1 -C 6 alkylene, R 1 : phenyl or pyridyl, each of which may be substituted with halogen or cyano which may be substituted, R 2 : —H or C 1 -C 6 alkyl, R 3 : —H, C 1 -C 6 alkyl or C 3 -C 8 cycloalkyl, R 4 : azetidin-2-yl, pyrrolidin-2-yl or piperidin-2-yl, each of which may be substituted with —OH, —O—C 1 -C 6 alkyl, oxo (═O), —SO 2 —C 1 -C 6 alkyl, or C 1 -C 6 alkyl which may be substituted with —OH, —O—C 1 -C 6 alkyl, or oxo (═O), and D: a ring selected from the group consisting of the following rings, wherein in these rings, the carbon atoms and nitrogen atoms constituting the rings may respectively be substituted with halogen, cyano, —O—C 1 -C 6 alkyl, or C 1 -C 6 alkyl which may be substituted with —OH, —O—C 1 -C 6 alkyl or halogen,