Patent ID: 7910579

Claim:
A compound, pharmaceutically acceptable salt or solvate thereof represented by formula (I): wherein R 1 and R 2 are independently hydrogen atom, lower alkyl group respectively, or cycloalkyl group, or 3- to 8-membered nitrogen-containing aliphatic ring formed by R 1 , R 2 and a nitrogen atom bonded thereto, together (carbon atoms which constitute the nitrogen-containing aliphatic ring may be substituted with nitrogen atom, sulfur atom or oxygen atom, and when the carbon atom is substituted with nitrogen atom, the nitrogen atom may be substituted with lower alkyl group), X 1 and X 2 are each independently denotes nitrogen atom, sulfur atom, or oxygen atom, R 3 is —O— lower alkyl group (the alkyl group is substituted with halogen atom, and furthermore may be optionally substituted hydoxy group), and m is an integer of 1 to 3 provided that the compounds are excluded wherein R 3 is a —O— lower alkyl group substituted with only halogen atom, and R 1 and R 2 are each independently hydrogen atom or lower alkyl group.