Patent ID: 8324395

Claim:
A compound represented by the formula wherein R 1a is (1) C 1-6 alkyl optionally substituted with one substituent selected from the group consisting of (i) hydroxy, and (ii) a 5-or 6-membered nonaromatic heterocyclic group optionally substituted with one C 1-6 alkyl substituent, (2) C 3-8 cycloalkyl, or (3) oxazolyl; R 2a is a hydrogen atom; R 3a is C 6-10 aryl optionally substituted with 1 or 2 substituents selected from the group consisting of (1) C 3-8 cycloalkyl optionally substituted with cyano, (2) C 1-6 alkyl optionally substituted with 1 to 3 substituents selected from the group consisting of a halogen atom and cyano, (3) C 1-6 alkyl-oxy optionally substituted with cyano, (4) a halogen atom, and (5) cyano; R 4a is a hydrogen atom or a halogen atom; R 5a is a hydrogen atom; X a is —O—; Y a is —NH—, —NHCO—, or —CONH—; and ring A a is a benzene ring optionally substituted with one substituent selected from the group consisting of (1) C 1-6 alkyl, (2) C 1-6 alkyl-oxy, and (3) a halogen atom, or a salt thereof.