Patent ID: 8008312

Claim:
A compound of Formula I, or a pharmaceutically acceptable salt or ester thereof: each K is independently N; Each Q, T, U, V, W, X, Y and Z are each independently H, R, acyl, F, Cl, Br, I, CN, OH, OR, NH 2 , NO 2 , NHR, NR 2 , SR, S 2 R, S—NHR, S 2 —NHR, S—NRR', S 2 —NRR', NHacyl, N(acyl) 2 , CO 2 H, CO 2 R, where R and R′ are independently selected from straight chain, branched or cyclic alkyl or aralkyl, as well as aryl and heteroaryl groups; R 1 and R 2 are hydrogen; R 3 , R 4 , R 5 and R 6 are independently selected from H, straight chain, branched or cyclic alkyl, aralkyl, aryl heteroaryl, acyl and imidolyl groups.