Patent ID: 7265213

Claim:
A compound having the formula: [Chel]-[linker]-X—CO—Ar-D wherein, [Chel] is a metal chelating moiety selected from the group consisting of nitrilotriacetic acid (NTA), iminodiacetic acid (IDA), bicinchoninic acid (BCA) and N,N,N′-tris (carboxymethyl)ethylenediamine (TED); [linker] is a substituted or unsubstituted (C 1-8 )alkyl; X is NR, —NR—NR—, or S, Ar is substituted or unsubstituted (C 6-10 )aryl or (C 5-10 )heteroaryl; and D is selected from the group consisting of —CHO, —NRNR 1 R 2 , and —Nh—N═CR 1 R 2 , wherein R, R 1 and R 2 are independently selected from hydrogen or substituted or unsubstituted (C 1-4 )alkyl.