Patent ID: 8664276

Claim:
A compound according to formula (II): or a pharmaceutically acceptable salt thereof, wherein R a , R b , R 4 , R 6 , R 7 , R 9 , R 10 are all H; R 2 and R 3 are independently H, halo, amino, alkylamino, dialkylamino, N-oxides of dialkylamino, arylalkylamino, trialkylammonium, mercapto, alkylthio, alkanoyl, nitro, nitrosyl, cyano, alkoxy, alkenyloxy, aryl, heteroaryl, sulfonyl, sulfonamide, CONR 11 R 12 , NR 11 CO(R 13 ), NR 11 COO(R 13 ), NR 11 CONR 12 R 13 ; R 11 , R 12 and R 13 , are independently, H, alkyl, aryl, heteroaryl or a fluorine; R 8 is NR c R d Z wherein R c is H, alkyl, alkoxy, aryl, heteroaryl, R d is an alkyl group, Z is a an unshared pair of electrons, H, alkyl, oxygen; and R 1 and R 5 are halogen.