2,4(1H,3H)-Pyrimidinedione, 5-methyl-1-[2-O-(phenoxythioxomethyl)-3,5-O-[1,1,3,3-tetrakis(1-methylethyl)-1,3-disiloxanediyl]-β-L-ribofuranosyl]-

2,4(1H,3H)-Pyrimidinedione, 5-methyl-1-[3,5-O-[1,1,3,3-tetrakis(1-methylethyl)-1,3-disiloxanediyl]-β-L-ribofuranosyl]-

N′-[1-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-3-O-[[bis(1-methylethyl)amino](2-cyanoethoxy)phosphino]-2-O-[(1,1-dimethylethyl)dimethylsilyl]-β-L-ribofuranosyl]-1,2-dihydro-2-oxo-4-pyrimidinyl]-N,N-dibutylmethanimidamide

N′-[9-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-3-O-[(1,1-dimethylethyl)dimethylsilyl]-β-L-ribofuranosyl]-6,9-dihydro-6-oxo-1H-purin-2-yl]-N,N-dibutylmethanimidamide

N′-[1-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-3-O-[(1,1-dimethylethyl)dimethylsilyl]-β-L-ribofuranosyl]-1,2-dihydro-2-oxo-4-pyrimidinyl]-N,N-dibutylmethanimidamide

1-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-3-O-[(1,1-dimethylethyl)dimethylsilyl]-β-L-ribofuranosyl]-2,4(1H,3H)-pyrimidinedione

N′-[9-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-2-O-[(1,1-dimethylethyl)dimethylsilyl]-β-L-ribofuranosyl]-6,9-dihydro-6-oxo-1H-purin-2-yl]-N,N-dibutylmethanimidamide

N′-[1-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-2-O-[(1,1-dimethylethyl)dimethylsilyl]-β-L-ribofuranosyl]-1,2-dihydro-2-oxo-4-pyrimidinyl]-N,N-dibutylmethanimidamide

N′-[9-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-β-L-ribofuranosyl]-6,9-dihydro-6-oxo-1H-purin-2-yl]-N,N-dibutylmethanimidamide

N′-[1-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-β-L-ribofuranosyl]-1,2-dihydro-2-oxo-4-pyrimidinyl]-N,N-dibutylmethanimidamide

N,N-Dibutyl-N′-(6,9-dihydro-6-oxo-9-β-L-ribofuranosyl-1H-purin-2-yl)methanimidamide

N,N-Dibutyl-N′-(1,2-dihydro-2-oxo-1-β-L-ribofuranosyl-4-pyrimidinyl)methanimidamide