Patent ID: 7635703

Claim:
A compound of Formula (I): or a salt thereof, wherein R 1 is hydrogen, hydroxy, halo, C 1-6 alkyl, C 1-6 alkoxy, amino or C 1-6 alkyl-amino; R 2 is hydrogen, hydroxy, C 1-6 alkyl, C 1-6 alkoxy, amino, C 1-6 alkyl-amino, amino-C 1-6 alkyl, C 1-6 alkyl-amino-C 1-6 alkyl, C 1-6 alkoxy-carbonyl, C 1-6 alkyl-amino-carbonyl or cyano; R 3 is hydrogen or C 1-6 alkyl; alternatively, R 2 and R 3 are taken together to form —CH═CH—CH═CH—; and R 4 is hydrogen, trihalo-C 1-6 alkyl, trihalo-C 1-6 alkoxy or cyano.