Patent ID: 8143278

Claim:
A compound of formula (I): wherein Y is —C(O)—; L is hydrogen, cyano, halogen, (C 1 -C 7 ) haloalkyl, (C 3 -C 7 ) cycloalkyl, (C 3 -C 7 ) alkyl-O—C(O)—, or (C 1 -C 7 ) alkyl that is optionally substituted by one or two hydroxyl groups; R 1 and R 2 are independently hydrogen or (C 1 -C 7 ) alkyl; R 3 and R 4 are independently hydrogen, halogen, (C 1 -C7) alkoxy; R is hydrogen, (C 1 -C 7 ) alkyl, (C 1 -C 7 ) haloalkyl, or (C 3 -C 7 ) cycloalkyl, (4-9)-membered heterocyclyl; or a pharmaceutically acceptable salt thereof; or an optical isomer thereof; or a mixture of optical isomers.