Patent ID: 8193351

Claim:
A compound represented by formula (4) or a pharmaceutically acceptable salt thereof: wherein, A represents O or S; X represents CH or N; Y represents O or S; Z represents an optionally substituted C 1-10 alkyl group, an optionally substituted C 2-10 alkenyl group, an optionally substituted C 2-10 alkynyl group, an optionally substituted C 3-10 cycloalkyl group, an optionally substituted C 6-12 aryl group, an optionally substituted 5- to 12-membered heteroaryl group, or an optionally substituted 3- to 12-membered heterocycle; n is an integer from 0 to 2; and R 1 represents a hydrogen atom, halogen atom, cyano group, C 1-6 alkyl group, C 1-4 haloalkyl group, C 2-6 alkenyl group, C 2-6 alkynyl group, C 1-6 alkoxy group, or C 1-6 alkylthio group.