Patent ID: 8163898

Claim:
A compound represented by formula (I) or a pharmaceutically acceptable salt thereof: wherein: R 1 represents unsubstituted or substituted C 1-6 alkyl, unsubstituted or substituted C 3-8 cycloalkyl, unsubstituted or substituted aryl, or unsubstituted or substituted heteroaryl, wherein the C 1-6 alkyl, C 3-8 cycloalkyl, aryl, or heteroaryl optionally having a substituent selected from the group consisting of halogen, C 1-6 alkyl, halo C 1-6 alkyl, C 1-6 alkyloxy, and halo C 1-6 alkyloxy; R 2 represents unsubstituted or substituted phenyl or unsubstituted or substituted heteroaryl, wherein the phenyl or heteroaryl optionally having a substituent selected from the group consisting of halogen, C 1-6 alkyl, halo C 1-6 alkyl, C 3-8 cycloalkyl, C 1-6 alkyloxy, phenyl, and nitrogen-containing heteroaryl; Q represents N or CH; M 1 and M 2 each independently represent a hydrogen atom or C 1-6 alkyl optionally substituted with halogen; and M 4 forms, together with M 2 or M 3 , —CH 2 — or —CH 2 —CH 2 —, provided that M 1 , M 2 , M 3 , and M 4 provide one —CH 2 — or —CH 2 —CH 2 —.