Patent ID: 7960526

Claim:
A compound of Formula I wherein: R 1 , R 2 , and R 3 are each independently H, Br, Cl, Fl, R, or OR wherein R is C 1 -C 6 -alkyl; X is selected from the group consisting of an acyl-leaving group, a C 1 -C 6 -alkyl ester of an amino acid, an active ester of an amino acid, an amino acid, an amino alcohol, an amino ether, an amino alcohol-O-phosphoramidite, an amino-nucleoside, an amino-nucleoside-O-phosphoramidite, and a diamine; n is an integer that is selected from 0 to 8; Z 1 and Z 2 are each independently C 1 -C 6 -alkyl, or aryl; or a salt thereof.