The present invention provides a medical drug containing a compound represented by general formula (1), a pharmaceutically acceptable salt thereof, or a solvate of the compound or salt. The following are provided: the compound represented by general formula (1) (In the formula, Ar is an aryl group or a 5-6 membered ring type heteroaryl group containing a nitrogen atom, oxygen atom or sulfur atom; Y is a hydrogen atom, a C1-C6 alkyl group, or the like; A is a C1-C3 alkylene chain optionally substituted with two C1-C2 alkyl groups; X is a hydrogen atom or a halogen atom; V is an oxygen atom or a methylene chain; and R is a group selected from among formulae); the pharmaceutically acceptable salt thereof; or a solvate of the compound or salt.