Patent ID: 7820650

Claim:
A compound having the formula a N-oxide form, a salt, a quaternary amine or a stereochemically isomeric form thereof, wherein R 1 is selected from the group consisting of hydrogen, C 1-6 alkyl, C 1-4 alkylthio, C 1 - 4 alkyloxy, and halo; R 2 is selected from the group consisting of hydrogen and C 1-6 alkyl; R 3 is selected from the group consisting of phenyl and 3-thienyl, wherein the phenyl is substituted with halo, cyano, C 1-4 alkyloxy, C 1-4 alkylthio, C 1-6 alkyl, or haloC 1-6 alkyl; and R 4 is hydrogen; or R 2 and R 4 form an extra bond; provided that R 3 is not 4-methylphenyl, 4-methoxyphenyl or 4-isopropylphenyl when R 1 , R 2 and R 4 are hydrogen; R 3 is not 4-methoxyphenyl, 4-ethylphenyl or 3-trifluorophenyl when R 1 is 7-chloro, and R 2 and R 4 are hydrogen; and R 3 is not 4-chlorophenyl when R 1 is hydrogen and R 2 and R 4 form an extra bond.