is hydrogen or an acyl group, for example an acetyl group, each n is independently an integer from about 1 to about 20, and [0246] wherein R1 can include the groups: [0247] and wherein R2 can include the groups: [0248] In another embodiment, a compound having Formula 122 is used to generate a compound having Formula 121 via phosphoramidite mediated coupling with a biologically active molecule, suc