Uridine, 5′-deoxy-5′-[(2-hydroxy-3,4-dioxo-1-cyclobuten-1-yl)amino]-

L-Proline, 1-[bis(1-methylethoxy)phosphinyl]-, 5′-ester with 3′-azido-3′-deoxythymidine

L-Isoleucine, N-[bis(1-methylethoxy)phosphinyl]-, 5′-ester with 3′-azido-3′-deoxythymidine

Guanosine, 8-(acetyl-9H-fluoren-2-ylamino)-5′-O-[bis(4-methoxyphenyl)phenylmethyl]-2′-deoxy-N-[[4-(1-methylethyl)phenoxy]acetyl]-, 3′-[2-cyanoethyl bis(1-methylethyl)phosphoramidite]

4-(1H-Imidazol-2-yl)-1-β-D-ribofuranosyl-1H-pyrazol-5-amine

1-(2,3,5-Tri-O-benzoyl-β-D-ribofuranosyl)-1H-pyrazolo[3,4-d]pyrimidin-4-amine

Guanosine, 5′-deoxy-5′-[(2-hydroxy-3,4-dioxo-1-cyclobuten-1-yl)amino]-

Guanosine, 5′-amino-N-[bis(4-methoxyphenyl)phenylmethyl]-5′-deoxy-2′,3′-O-(1-methylethylidene)-

Guanosine, N-[bis(4-methoxyphenyl)phenylmethyl]-5′-deoxy-5′-[(2-ethoxy-3,4-dioxo-1-cyclobuten-1-yl)amino]-2′,3′-O-(1-methylethylidene)-

Adenosine, 5′-deoxy-5′-[(2-hydroxy-3,4-dioxo-1-cyclobuten-1-yl)amino]-

5′-Amino-N-[bis(4-methoxyphenyl)phenylmethyl]-5′-deoxy-2′,3′-O-(1-methylethylidene)adenosine

Adenosine, N-[bis(4-methoxyphenyl)phenylmethyl]-5′-deoxy-5′-[(2-ethoxy-3,4-dioxo-1-cyclobuten-1-yl)amino]-2′,3′-O-(1-methylethylidene)-

Cytidine, 5′-deoxy-5′-[(2-hydroxy-3,4-dioxo-1-cyclobuten-1-yl)amino]-

5′-Amino-N-[bis(4-methoxyphenyl)phenylmethyl]-5′-deoxy-2′,3′-O-(1-methylethylidene)cytidine

Cytidine, N-[bis(4-methoxyphenyl)phenylmethyl]-5′-deoxy-5′-[(2-ethoxy-3,4-dioxo-1-cyclobuten-1-yl)amino]-2′,3′-O-(1-methylethylidene)-

Uridine, 5′-deoxy-5′-[(2-ethoxy-3,4-dioxo-1-cyclobuten-1-yl)amino]-

Guanosine, 2′,5′-dideoxy-5′-[(2-hydroxy-3,4-dioxo-1-cyclobuten-1-yl)amino]-

Guanosine, 2′,5′-dideoxy-5′-[(2-methoxy-3,4-dioxo-1-cyclobuten-1-yl)amino]-

Adenosine, 2′,5′-dideoxy-5′-[(2-hydroxy-3,4-dioxo-1-cyclobuten-1-yl)amino]-

Cytidine, 2′,5′-dideoxy-5′-[(2-hydroxy-3,4-dioxo-1-cyclobuten-1-yl)amino]-