Patent ID: 8293209

Claim:
An oligomer represented by the structure of Formula I: wherein: n is an integer between 2 to 10; each of L 1 -L n is independently a first linking group; each Y is independently a delivering group or absent, provided that at least one of Y is a delivering group, wherein said delivering group is selected from the group consisting of an amine, histidine, guanidine, polyguanidine, imidazole and polyimidazole; each of F is independently, nothing, or phosphate and each of Z 1 and Z 2 is independently a reactive group capable of binding a biologically active moiety or absent, provided that at least one of Z 1 and Z 2 is a reactive group wherein said reactive group is hydroxy, amine, halide, a phosphorous-containing group, phosphoramidite, C-amide, N-amide, thiol, COOH or optionally a protected reactive group; wherein said L 1 -L n are independently a substituted or unsubstituted hydrocarbon alkyl chain or a substituted or unsubstituted hydrocarbon alkyl chain optionally interrupted by at least one heteroatom, said heteroatom is an oxygen, nitrogen, sulfur or any combination thereof; wherein w, w′ and w″ are each independently between 1 to 6.