Patent ID: 7208493

Claim:
A compound of structure (III): wherein: each of Z 2 and Z 4 is C, each of Z 1 , Z 3 , Z 5 , and Z 6 is N; each X is NH 2 ; each Y is independently selected from a group consisting of —OR d , —NR d 2 , —SR d , and —OPO 3 H 2 , wherein R d is selected from a group consisting of H, lower alkyl, aryl, and —(CH 2 ) 2 NH(CH 2 CH 3 ); or each Y is independently selected from a group consisting of alkyl, substituted alkyl, aryl, substituted aryl, and halogen, wherein said substituents are selected from a group consisting of halogen, —OR e , —NR e 2 , —SR e , and —P(O)(OH) 2 , wherein R e is selected from a group consisting of —H, lower alkyl, and aryl; or each Y is independently selected from a group consisting of CH 2 glycinyl, CH 2 NHethoxy, CH 2 NHCH 2 alkyl, CH 2 NHCH 2 t-Bu, CH 2 NHCH 2 aryl, and CH 2 NHCH 2 substituted aryl; or when n is 2, each Y is taken together to form a fused aromatic ring system; and m and n are each independently 1 to 4, wherein when m=n=2, Y is not phenyl or 4-hydroxyphenyl, or tautomers thereof.