Patent ID: 6875750

Claim:
A compound of Formula (I): wherein Y is N or —CR 3 , R 1 and R 3 independently from each other are H, H 3 , —NH(CH 2 ) n NHR 4 or —NH(C 2 H 5 O) n C 2 H 5 NHR 4 , with R 4 selected from the group consisting of fluorophores, affinity tags, crosslinking agents, chromophors, proteins, peptides, amino acids, nucleotides, nucleosides, nucleic acids, carbohydrates, lipids, PEG, transfection reagents, beads and intercalating agents, and n being an integer from 1 to 250, and R 2 is selected from H, 3 H, and —CH 2 CH(COOH)(NH 2 ), provided when R 1 is —NH(CH 2 ) n NHR 4 or —NH(C 2 H 5 O) n C 2 H 5 NHR 4 , Y is N or CH; and when R 3 is —NH(CH 2 ) n NHR 4 or —NH(C 2 H 5 O) n C 2 H 5 NHR 4 , R 1 is H.