Patent ID: 8513422

Claim:
A compound according to formula (Ia) or a salt thereof: wherein R 1 , R 2 , and R 3 , which are the same or different from each other, are H or lower alkyl; R 4 is H, lower alkyl, halogen, -loweralkylene-OR 0 , or loweralkylene-CO-lowerakyl; R 5 is H, lower alkyl, halogen, or —OR 0 ; R 6 is H, lower alkyl, halogen, halogeno lower alkyl, —COOR 0 , aryl, heterocyclic group, nitro, CN, —CONR 10 R 11 , NR 10 R 11 , —NR 0 C(O)R 10 , —OR 0 , —O— halogeno lower alkyl, —SR 0 , —S(O) 2 -lower alkyl, —O-cycloalkyl, or —O-loweralkylene-aryl; R 7 is H, lower alkyl, halogen, —O-loweralkylene-aryl, or —O-lower alkyl; or R 6 and R 7 are combined to form —O-lower alkylene-O—; R 8 is H, halogen, or lower alkyl; R 0 , which is the same or different from each other, is H or lower alkyl; and R 10 and R 11 , which are the same or different from each other, are H or lower alkyl.