The present invention provides a compound represented by Formula (II): wherein R1 is a chlorine atom, a fluorine atom, a methyl group or an ethynyl group; Ar is a group represented by the following Formula (a), Formula (b), Formula (c) or Formula (d): wherein R2 is a C1-6 alkyl group which may be substituted with one or more halogen atoms, a C1-6 alkoxy group which may be substituted with one or more halogen atoms, a C1-3 alkylthio group, a halogen atom, a C1-3 alkylcarbonyl group or a C2-5 alkynyl group which may be substituted with —OR4; R3 is a hydrogen atom or a C1-3 alkyl group; R4 is a hydrogen atom or a C1-3 alkyl group; provided that Ar is a group represented by Formula (a) when R1 is a fluorine atom, methyl group or an ethynyl group, and that R2 is methoxy group, an ethoxy group, an isopropyl group, a propyl group, a trifluoromethyl group, a trifluoromethoxy group, 2-fluoroethyl group or 1-propynyl group when R1 is a methyl group or a pharmaceutically acceptable salt or a solvate thereof and a pharmaceutical agent, a pharmaceutical composition and so on comprising the compound.