Patent ID: 8143258

Claim:
A compound represented by the formula wherein R 1 is methyl or cyclopropyl; X is —O; Y is wherein ring A is a benzene ring optionally having 1 to 3 halogen atoms; Z is a group represented by (1) —NHCO—; (2) —NHCO—W 1b —, wherein W 1b is —CH 2 — or —CH(CH 3 ) 2 —; (3) —NHCONH—; or (4) —CONH—; R 5 is phenyl optionally having 1 to 3 substituents selected from the group consisting of: (a) a halogen atom, (b) a C 1-6 alkyl optionally having 1 to 3 substituents selected from the group consisting of: (i) a halogen atom, and (ii) cyano; and (c) a C 1-6 alkoxy optionally having 1 to 3 substituents selected from halogen atoms; and R 6 is a cyano group, or a salt thereof.