Patent ID: 7154002

Claim:
A compound comprising the formula: wherein R 1 comprises a moiety attached to the nitrogen selected from the group consisting of a substituted straight chained C 1-12 alkyl, C 2-12 oxaalkyl and C 2-12 aminoalkyl where at least one of the substituents is selected from the group consisting of substituted and unsubstituted straight chained C 1-12 alkyls, C 2-12 oxaalkyls or C 2-12 aminoalkyls and substituted and unsubstituted 3, 4, 5, 6, 7 or 8 membered rings; R 2 comprises a moiety attached to the nitrogen selected from the group consisting of hydrogen, a substituted or unsubstituted straight chained C 1-12 alkyl, C 2-12 aminoalkyl or C 2-12 oxaalkyl, and a substituted and unsubstituted 3, 4, 5, 6, 7 or 8 membered ring, and —C(O)H and —C(O)—C 1-3 alkyl; R 3 and R 4 are each independently selected from the group consisting of hydrogen, a substituted or unsubstituted straight chained C 1-12 alkyl, C 2-12 aminoalkyl or C 2-12 oxaalkyl, and a substituted and unsubstituted 3, 4, 5, 6, 7 or 8 membered ring, and —C(O)H and —C(O)—C 1-3 alkyl, with the proviso that R 3 and R 4 are not both hydrogen; R 5 is selected from the group consisting of a carbonyl, a substituted or unsubstituted C 1-3 alkyl, a substituted or unsubstituted —C 1-3 alkyl-C(O), a substituted or unsubstituted —C(O)—C 1-3 alkyl, and a substituted or unsubstituted —C(O)C(O)C 1-3 alkyl; and M is a substituent capable of complexing with a protein metal ion.