Patent ID: 6908932

Claim:
A compound of formula 1: wherein R 1 is H, hydroxy, amino, lower alkyl, or trihalomethyl; R 2 is amino, lower alkylamino, —NC(═O)—R 9 , where R 9 is a straight or branched lower alkyl having 2-6 carbon atoms, arylamino, arylacyl-amino, heteroaryl-amino, heteroaryl-acyl amino, or R 1 and R 2 are bridged by the substituent —CH(—R 8 )═N—X—, where X is CH, NH, O, or S, and R 8 is H, lower alkyl, aryl, or aralkyl; R 3 is H or lower alkyl; and R 4 , R 5 , R 6 , R 7 are each independently H, halo, hydroxy, amino, nitro, lower alkyl, or lower alkoxy; and pharmaceutically acceptable salts thereof.