Patent ID: 8410150

Claim:
A compound represented by the following structural formula or a pharmaceutically acceptable salt thereof: Wherein R 1 is —OH or —OC 1-6 alkyl; R 3 is —N(R 7 R 8 ) or —N ± (R 7 R 8 R 9 )X − ; each of R 7 , R 8 , R 9 independently is —H or C 1-6 alkyl; X − is a pharmaceutically acceptable counter ion; and a) Q is —C(═O)—, —C(═S)—, —C(O)NH—or —C(S)NH—; and R 4 is a substituted aryl group, or a substituted or unsubstituted heteroaryl group, provided that when R 4 is a substituted phenyl group, then R 3 is —N ± (R 7 R 8 R 9 )X − ; or b) Q is —C(═NH)—, —S(O)—, —S(O) 2 —, —S(O)—NH—, or —S(O) 2 —NH—; and R 4 is a substituted or unsubstituted aryl group, or substituted or unsubstituted heteroaryl group, provided that when Q is —S(O) 2 —, then R 4 is not a tolyl group; or c) Q is —C(═O)—N(R 5 )—, —C(═S)—N(R 5 )—, —C(═NH)—N(R 5 )—, —S(O)—N(R 5 )— or —S(O) 2 —N(R 5 )—; and R 4 and R 5 are each independently a substituted or unsubstituted aliphatic group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heteroaryl group, or R 4 and R 5 taken together with the nitrogen atom of N(R 4 R 5 ) form a substituted or unsubstituted non-aromatic heterocyclic ring.