Patent ID: 7265137

Claim:
A compound having the following formula (I): or a salt thereof, wherein: R 1 is phenyl or naphthyl, each of which can have substituents selected from the group consisting of C 1-8 alkyl, C 1-8 alkyl having halogen, C 1-8 alkoxy, C 1-8 alkoxy having halogen, C 2-8 alkenyl, C 2-8 alkynyl, halogen, C 2-7 acyl, benzoyl, hydroxyl, nitro, amino, phenyl and pyridyl; R 2 is C 2-8 alkyl; A is oxygen or sulfur; X is a C 1-8 alkylene chain which can have a C 1-8 alkyl substituent and which can contain a double bond; Y is C(═O), CH═CH, or C(═CH 2 ); each of R 3 , R 4 and R 5 is hydrogen, C 1-8 alkyl, C 1-8 alkyl having halogen, C 1-8 alkoxy, C 1-8 alkoxy having halogen, C 2-8 alkenyl, C 2-8 alkynyl, halogen, C 2-7 acyl, benzoyl, hydroxyl, nitro, amino, phenyl, or pyridyl; B is CH; Z is oxygen or sulfur; each of R 6 and R 7 is hydrogen or C 1-8 alkyl; and R 8 is hydrogen or C 1-8 alkyl.