Patent ID: 7084146

Claim:
A compound of formula I in which R 1 represents a hydrogen or a methyl group; R 2 represents a hydrogen atom or an optionally substituted C 1 –C 10 -alkyl, C 2 –C 10 -alkenyl, C 2 –C 10 -alkynyl, C 4 –C 10 -alkadienyl or phenyl group, wherein the optional substituents are selected from the group consisting of nitro, cyano, C 3 –C 6 -cycloalkyl; C 3 –C 6 -cycloalkenyl, C 1 –C 6 -haloalkyl, C 3 –C 6 -halocycloalkyl, C 1 –C 6 -alkoxy, C 1 –C 6 -haloalkoxy, tri-C 1 –C 4 -alkylsilyl, phenyl, halophenyl, dihalophenyl and pyridyl; Hal represents a halogen atom and L 1 through L 5 each represent a hydrogen or halogen atom or an C 1 –C 10 -alkyl, C 1 –C 10 -alkoxy or nitro group, provided that at least one of L 1 through L 5 represents a nitro or alkoxy group.