N′-[8-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-3-O-[[bis(1-methylethyl)amino](2-cyanoethoxy)phosphino]-2-deoxy-β-D-erythro-pentofuranosyl]-2,8-dihydro-2-oxoimidazo[1,2-a]-1,3,5-triazin-4-yl]-N,N-dimethylmethanimidamide

N′-[8-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-2-deoxy-β-D-erythro-pentofuranosyl]-2,8-dihydro-2-oxoimidazo[1,2-a]-1,3,5-triazin-4-yl]-N,N-dimethylmethanimidamide

N′-[8-(2-Deoxy-β-D-erythro-pentofuranosyl)-2,8-dihydro-2-oxoimidazo[1,2-a]-1,3,5-triazin-4-yl]-N,N-dimethylmethanimidamide

Adenosine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-2′-deoxy-N-[(dibutylamino)carbonyl]-2-[2-(4-nitrophenyl)ethoxy]-

Adenosine, 2′-deoxy-N-[(dibutylamino)carbonyl]-2-[2-(4-nitrophenyl)ethoxy]-

Adenosine, 2′-deoxy-N-[(dibutylamino)carbonyl]-2′,3′-bis-O-[(1,1-dimethylethyl)dimethylsilyl]-2-[2-(4-nitrophenyl)ethoxy]-

Adenosine, 2′-deoxy-N-[(dibutylamino)carbonyl]-1,2-dihydro-2-oxo-

Adenosine, 2′-deoxy-N-[(dibutylamino)carbonyl]-2′,3′-bis-O-[(1,1-dimethylethyl)dimethylsilyl]-1,2-dihydro-2-oxo-

Uridine, 3-benzoyl-3′-O-[3-hydroxy-1,1,3,3-tetrakis(1-methylethyl)disiloxanyl]-, 2′-benzoate

2-[2,3-O-(Dibutylstannylene)-β-D-ribofuranosyl]-1,2,4-triazine-3,5(2H,4H)-dione

Uridine, 2′,3′-O-(dibutylstannylene)-5′-O-(triphenylmethyl)-