1-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-2,6-dideoxy-2-fluoro-3-O-(4-hydroxy-1,4-dioxobutyl)-β-D-allofuranosyl]-2,4(1H,3H)-pyrimidinedione

1-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-6-deoxy-3-O-(4-hydroxy-1,4-dioxobutyl)-2-O-methyl-β-D-allofuranosyl]-2,4(1H,3H)-pyrimidinedione

1-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-2,6-dideoxy-2-fluoro-3-O-(4-hydroxy-1,4-dioxobutyl)-α-L-talofuranosyl]-2,4(1H,3H)-pyrimidinedione

1-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-6-deoxy-3-O-(4-hydroxy-1,4-dioxobutyl)-2-O-methyl-α-L-talofuranosyl]-2,4(1H,3H)-pyrimidinedione

N-[1-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-3-O-[[bis(1-methylethyl)amino](2-cyanoethoxy)phosphino]-2,6-dideoxy-2-fluoro-β-D-allofuranosyl]-1,2-dihydro-2-oxo-4-pyrimidinyl]acetamide

N-[1-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-3-O-[[bis(1-methylethyl)amino](2-cyanoethoxy)phosphino]-6-deoxy-2-O-methyl-β-D-allofuranosyl]-1,2-dihydro-2-oxo-4-pyrimidinyl]acetamide

N-[1-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-3-O-[[bis(1-methylethyl)amino](2-cyanoethoxy)phosphino]-2,6-dideoxy-2-fluoro-α-L-talofuranosyl]-1,2-dihydro-2-oxo-4-pyrimidinyl]acetamide

N-[1-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-3-O-[[bis(1-methylethyl)amino](2-cyanoethoxy)phosphino]-6-deoxy-2-O-methyl-α-L-talofuranosyl]-1,2-dihydro-2-oxo-4-pyrimidinyl]acetamide

1-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-3-O-[(S)-[bis(1-methylethyl)amino](2-cyanoethoxy)phosphino]-2,6-dideoxy-β-D-ribo-hexofuranosyl]-2,4(1H,3H)-pyrimidinedione

1-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-3-O-[(R)-[bis(1-methylethyl)amino](2-cyanoethoxy)phosphino]-2,6-dideoxy-β-D-ribo-hexofuranosyl]-2,4(1H,3H)-pyrimidinedione

1-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-3-O-[(S)-[bis(1-methylethyl)amino](2-cyanoethoxy)phosphino]-2,6-dideoxy-β-D-ribo-hexofuranosyl]-5-methyl-2,4(1H,3H)-pyrimidinedione

1-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-3-O-[(R)-[bis(1-methylethyl)amino](2-cyanoethoxy)phosphino]-2,6-dideoxy-β-D-ribo-hexofuranosyl]-5-methyl-2,4(1H,3H)-pyrimidinedione

1-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-3-O-[(S)-[bis(1-methylethyl)amino](2-cyanoethoxy)phosphino]-2,6-dideoxy-2-fluoro-β-D-allofuranosyl]-2,4(1H,3H)-pyrimidinedione

1-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-3-O-[(R)-[bis(1-methylethyl)amino](2-cyanoethoxy)phosphino]-2,6-dideoxy-2-fluoro-β-D-allofuranosyl]-2,4(1H,3H)-pyrimidinedione

1-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-3-O-[(S)-[bis(1-methylethyl)amino](2-cyanoethoxy)phosphino]-6-deoxy-2-O-methyl-β-D-allofuranosyl]-2,4(1H,3H)-pyrimidinedione

1-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-3-O-[(R)-[bis(1-methylethyl)amino](2-cyanoethoxy)phosphino]-6-deoxy-2-O-methyl-β-D-allofuranosyl]-2,4(1H,3H)-pyrimidinedione

1-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-3-O-[(S)-[bis(1-methylethyl)amino](2-cyanoethoxy)phosphino]-2,6-dideoxy-α-L-lyxo-hexofuranosyl]-2,4(1H,3H)-pyrimidinedione

1-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-3-O-[(R)-[bis(1-methylethyl)amino](2-cyanoethoxy)phosphino]-2,6-dideoxy-α-L-lyxo-hexofuranosyl]-2,4(1H,3H)-pyrimidinedione

1-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-3-O-[(S)-[bis(1-methylethyl)amino](2-cyanoethoxy)phosphino]-2,6-dideoxy-α-L-lyxo-hexofuranosyl]-5-methyl-2,4(1H,3H)-pyrimidinedione

1-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-3-O-[(R)-[bis(1-methylethyl)amino](2-cyanoethoxy)phosphino]-2,6-dideoxy-α-L-lyxo-hexofuranosyl]-5-methyl-2,4(1H,3H)-pyrimidinedione