Patent ID: 7507859

Claim:
A compound represented by formulas IV: wherein X represents independently for each occurrence O or —N(R 4 )—; Y represents independently for each occurrence —N(R 4 )—, or —C(R 2 ) 2 —; Z represents independently for each occurrence O or —N(R 5 )—; R 1 is aryl, aralkyl, R 2 is H, alkyl, or halogen; R 3 , R 4 , and R 5 represent independently for each occurrence H, alkyl, aryl, or aralkyl; R 6 is alkyl, aryl, aralkyl, or a photocleavable protecting group having a molecular weight less than 700 g/mol; m represents independently for each occurrence 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, or 25; n 1 , n 2 , and n 3 each represent independently 0, 1, 2, 3, 4, 5, 6, 7, or 8; and A is an anion with a net charge of negative one.