Patent ID: 7173056

Claim:
A chemical compound of formula (I): wherein: R 1 and R 2 are independently selected from hydrogen and alkyl; R 3 is alkyl; R 4 and R 5 are selected from hydrogen and alkyl R 6 and R 7 are independently selected from hydrogen, halogen, hydroxy, alkyl, aryl, amino, alkylamino, dialkylamino, alkoxy, aryloxy, alkylthio, alkylsulfoxyl, alkylsulfonyl, nitro, carbonitrile, carbo-alkoxy, carbo-aryloxy and carboxyl; and A is a 5- or 6-membered carbocyclic ring wherein the atoms of the ring A, other than the unsaturated carbon atoms of the phenyl ring to which the ring A is fused, are saturated or unsaturated, or a pharmaceutically acceptable salt, or addition compound thereof.