1-[(5R,6R,8R,9R)-9-(Acetyloxy)-4-amino-6-[(benzoyloxy)methyl]-2,2-dioxido-1,7-dioxa-2-thiaspiro[4.4]non-3-en-8-yl]-5-methyl-3-nonyl-2,4(1H,3H)-pyrimidinedione

1-[(5R,6R,8R,9R)-9-(Acetyloxy)-4-amino-6-[(benzoyloxy)methyl]-2,2-dioxido-1,7-dioxa-2-thiaspiro[4.4]non-3-en-8-yl]-5-methyl-3-octyl-2,4(1H,3H)-pyrimidinedione

1-[(5R,6R,8R,9R)-9-(Acetyloxy)-4-amino-6-[(benzoyloxy)methyl]-2,2-dioxido-1,7-dioxa-2-thiaspiro[4.4]non-3-en-8-yl]-3-heptyl-5-methyl-2,4(1H,3H)-pyrimidinedione

1-[(5R,6R,8R,9R)-9-(Acetyloxy)-4-amino-6-[(benzoyloxy)methyl]-2,2-dioxido-1,7-dioxa-2-thiaspiro[4.4]non-3-en-8-yl]-3-ethyl-5-methyl-2,4(1H,3H)-pyrimidinedione

1-[2-C-Cyano-2-O-(methylsulfonyl)-3,5-O-[1,1,3,3-tetrakis(1-methylethyl)-1,3-disiloxanediyl]-β-D-arabinofuranosyl]-5-methyl-2,4(1H,3H)-pyrimidinedione

1-[(5R,6S,8R,9R)-4-Amino-6-[[[(1,1-dimethylethyl)dimethylsilyl]oxy]methyl]-9-hydroxy-2,2-dioxido-7-oxa-2-thia-1-azaspiro[4.4]non-3-en-8-yl]-3-hexyl-5-methyl-2,4(1H,3H)-pyrimidinedione

1-[(5R,6S,8R,9R)-4-Amino-9-hydroxy-6-(hydroxymethyl)-2,2-dioxido-7-oxa-2-thia-1-azaspiro[4.4]non-3-en-8-yl]-3-hexyl-5-methyl-2,4(1H,3H)-pyrimidinedione

1-[(5S,6S,8R,9R)-9-(Acetyloxy)-4-amino-6-[(benzoyloxy)methyl]-2,2-dioxido-7-oxa-2-thia-1-azaspiro[4.4]non-3-en-8-yl]-3-hexyl-5-methyl-2,4(1H,3H)-pyrimidinedione

1-[(5R,6S,8R,9R)-4-Amino-6-[(benzoyloxy)methyl]-9-hydroxy-2,2-dioxido-7-oxa-2-thia-1-azaspiro[4.4]non-3-en-8-yl]-3-hexyl-5-methyl-2,4(1H,3H)-pyrimidinedione

1-[(5S,6S,8R,9R)-4-Amino-6-[(benzoyloxy)methyl]-9-[[(1,1-dimethylethyl)dimethylsilyl]oxy]-2,2-dioxido-7-oxa-2-thia-1-azaspiro[4.4]non-3-en-8-yl]-3-hexyl-5-methyl-2,4(1H,3H)-pyrimidinedione

1-[(5S,6S,8R,9R)-4-Amino-9-[[(1,1-dimethylethyl)dimethylsilyl]oxy]-6-(hydroxymethyl)-2,2-dioxido-7-oxa-2-thia-1-azaspiro[4.4]non-3-en-8-yl]-3-hexyl-5-methyl-2,4(1H,3H)-pyrimidinedione

1-[3-C-Cyano-3-deoxy-2,5-bis-O-[(1,1-dimethylethyl)dimethylsilyl]-3-[(methylsulfonyl)amino]-β-D-xylofuranosyl]-3-hexyl-5-methyl-2,4(1H,3H)-pyrimidinedione

1-[3-Amino-3-C-cyano-3-deoxy-2,5-bis-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-xylofuranosyl]-3-hexyl-5-methyl-2,4(1H,3H)-pyrimidinedione

1-[3-Amino-3-deoxy-2,5-bis-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-xylofuranosyl]-3-hexyl-5-methyl-2,4(1H,3H)-pyrimidinedione

1-[(5S,6S,8R,9R)-4-Amino-6-[[[(1,1-dimethylethyl)dimethylsilyl]oxy]methyl]-9-hydroxy-1-methyl-2,2-dioxido-7-oxa-2-thia-1-azaspiro[4.4]non-3-en-8-yl]-3-hexyl-5-methyl-2,4(1H,3H)-pyrimidinedione

1-[(5S,6S,8R,9R)-4-Amino-9-hydroxy-6-(hydroxymethyl)-1-methyl-2,2-dioxido-7-oxa-2-thia-1-azaspiro[4.4]non-3-en-8-yl]-3-hexyl-5-methyl-2,4(1H,3H)-pyrimidinedione

1-[(5R,6S,8R,9R)-9-(Acetyloxy)-4-amino-6-[(benzoyloxy)methyl]-1-methyl-2,2-dioxido-7-oxa-2-thia-1-azaspiro[4.4]non-3-en-8-yl]-3-hexyl-5-methyl-2,4(1H,3H)-pyrimidinedione

1-[(5S,6S,8R,9R)-4-Amino-6-[(benzoyloxy)methyl]-9-hydroxy-1-methyl-2,2-dioxido-7-oxa-2-thia-1-azaspiro[4.4]non-3-en-8-yl]-3-hexyl-5-methyl-2,4(1H,3H)-pyrimidinedione

1-[(5R,6S,8R,9R)-4-Amino-6-[(benzoyloxy)methyl]-9-[[(1,1-dimethylethyl)dimethylsilyl]oxy]-1-methyl-2,2-dioxido-7-oxa-2-thia-1-azaspiro[4.4]non-3-en-8-yl]-3-hexyl-5-methyl-2,4(1H,3H)-pyrimidinedione