S-[3-[3,6-Dihydro-3-[2,3-O-(1-methylethylidene)-β-D-ribofuranosyl]-2,6-dioxo-1(2H)-pyrimidinyl]propyl]-N-[(1,1-dimethylethoxy)carbonyl]-L-cysteine methyl ester

(7S,8R)-3-(2-Deoxy-β-D-erythro-pentofuranosyl)-3,7,8,9-tetrahydro-8-hydroxypyrimido[2,1-i]purine-7-methanol

N2-[(1,1-Dimethylethoxy)carbonyl]-N-[1-[5-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-arabinofuranosyl]-1,2-dihydro-2-oxo-4-pyrimidinyl]-L-asparagine 1,1-dimethylethyl ester

L-Glutamine, N-[1-(2-deoxy-2,2-difluoro-β-D-erythro-pentofuranosyl)-1,2-dihydro-2-oxo-4-pyrimidinyl]-

N-[1-(2-Deoxy-2,2-difluoro-β-D-erythro-pentofuranosyl)-1,2-dihydro-2-oxo-4-pyrimidinyl]-N2-[(1,1-dimethylethoxy)carbonyl]-L-glutamine 1,1-dimethylethyl ester

N-(1-β-D-Arabinofuranosyl-1,2-dihydro-2-oxo-4-pyrimidinyl)-L-glutamine

N-(1-β-D-Arabinofuranosyl-1,2-dihydro-2-oxo-4-pyrimidinyl)-N2-[(1,1-dimethylethoxy)carbonyl]-L-glutamine 1,1-dimethylethyl ester

L-Asparagine, N-[1-(2-deoxy-2,2-difluoro-β-D-erythro-pentofuranosyl)-1,2-dihydro-2-oxo-4-pyrimidinyl]-

N-(1-β-D-Arabinofuranosyl-1,2-dihydro-2-oxo-4-pyrimidinyl)-L-asparagine

N-[1-(2-Deoxy-2,2-difluoro-β-D-erythro-pentofuranosyl)-1,2-dihydro-2-oxo-4-pyrimidinyl]-N2-[(1,1-dimethylethoxy)carbonyl]-L-asparagine 1,1-dimethylethyl ester

9H-Purin-6-amine, 9-[(6E)-5,6,7-trideoxy-7-[[[[(2,3-dihydro-2,2,4,6,7-pentamethyl-5-benzofuranyl)sulfonyl]amino]thioxomethyl]amino]-2,3-O-(1-methylethylidene)-β-D-ribo-hept-6-enofuranosyl]-