Patent ID: 8791263

Claim:
A compound represented by the general formula (M): wherein R 1 represents a pyridyl group, a quinolyl group or an isoquinolyl group, R 2 represents a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 3 carbon atoms, OR 3 , N(R 3 ) 2 , C(═O)OR 3 or C(═O)N(R 3 ) 2 , R 3 represents a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, or an acyl group having 1 to 4 carbon atoms, R 4 represents a hydrogen atom, an oxygen atom or OR 5 , and R 5 represents a hydrogen atom, an alkyl group having 1 to 3 carbon atoms, or an acyl group having 1 to 3 carbon atoms, and is a single bond or double bond, with proviso that when a partial formula R 4 is ═R 4 , a partial formula and when a partial formula a partial formula R 4 is —R 4 ; or a pharmaceutically acceptable salt thereof.