1,7-Dioxa-2-phosphaspiro[4.4]non-3-ene-3-carboxylic acid, 4-amino-8-(3,4-dihydro-5-methyl-2,4-dioxo-1(2H)-pyrimidinyl)-9-[[(1,1-dimethylethyl)dimethylsilyl]oxy]-6-[[[(1,1-dimethylethyl)dimethylsilyl]oxy]methyl]-2-ethoxy-, ethyl ester, 2-oxide, (2S,5R,6R,8R,9R)-

1,7-Dioxa-2-phosphaspiro[4.4]non-3-ene-3-carboxylic acid, 4-amino-8-(3,4-dihydro-5-methyl-2,4-dioxo-1(2H)-pyrimidinyl)-6-[[[(1,1-dimethylethyl)dimethylsilyl]oxy]methyl]-2-ethoxy-9-hydroxy-, ethyl ester, 2-oxide, (2S,5S,6R,8R,9R)-

1,7-Dioxa-2-phosphaspiro[4.4]non-3-ene-3-carboxylic acid, 4-amino-8-(3,4-dihydro-5-methyl-2,4-dioxo-1(2H)-pyrimidinyl)-2-ethoxy-9-hydroxy-6-(hydroxymethyl)-, ethyl ester, 2-oxide, (2S,5S,6R,8R,9R)-

1,7-Dioxa-2-phosphaspiro[4.4]non-3-ene-3-carboxylic acid, 4-amino-8-(3,4-dihydro-5-methyl-2,4-dioxo-1(2H)-pyrimidinyl)-9-[[(1,1-dimethylethyl)dimethylsilyl]oxy]-6-[[[(1,1-dimethylethyl)dimethylsilyl]oxy]methyl]-2-ethoxy-, ethyl ester, 2-oxide, (2R,5R,6R,8R,9R)-

1,7-Dioxa-2-phosphaspiro[4.4]non-3-ene-3-carboxylic acid, 4-amino-8-(3,4-dihydro-5-methyl-2,4-dioxo-1(2H)-pyrimidinyl)-6-[[[(1,1-dimethylethyl)dimethylsilyl]oxy]methyl]-2-ethoxy-9-hydroxy-, ethyl ester, 2-oxide, (2R,5S,6R,8R,9R)-

1,7-Dioxa-2-phosphaspiro[4.4]non-3-ene-3-carboxylic acid, 4-amino-8-(3,4-dihydro-5-methyl-2,4-dioxo-1(2H)-pyrimidinyl)-2-ethoxy-9-hydroxy-6-(hydroxymethyl)-, ethyl ester, 2-oxide, (2R,5S,6R,8R,9R)-

1,7-Dioxa-2-phosphaspiro[4.4]non-3-ene-3-carboxylic acid, 9-(acetyloxy)-4-amino-6-[(benzoyloxy)methyl]-8-(3,4-dihydro-5-methyl-2,4-dioxo-1(2H)-pyrimidinyl)-2-ethoxy-, ethyl ester, 2-oxide, (2S,5R,6R,8R,9R)-

1,7-Dioxa-2-phosphaspiro[4.4]non-3-ene-3-carboxylic acid, 9-(acetyloxy)-4-amino-6-[(benzoyloxy)methyl]-8-(3,4-dihydro-5-methyl-2,4-dioxo-1(2H)-pyrimidinyl)-2-ethoxy-, ethyl ester, 2-oxide, (2R,5R,6R,8R,9R)-

6-Bromo-1,4-dihydro-4-oxo-1-β-D-ribofuranosyl-3-quinolinecarboxylic acid

7-Bromo-1,4-dihydro-4-oxo-1-β-D-ribofuranosyl-3-quinolinecarboxylic acid

6-Chloro-1,4-dihydro-4-oxo-1-β-D-ribofuranosyl-3-quinolinecarboxylic acid

7-Chloro-1,4-dihydro-4-oxo-1-β-D-ribofuranosyl-3-quinolinecarboxylic acid

Ethyl 6-bromo-1,4-dihydro-4-oxo-1-(2,3,5-tri-O-benzoyl-β-D-ribofuranosyl)-3-quinolinecarboxylate

Ethyl 7-bromo-1,4-dihydro-4-oxo-1-(2,3,5-tri-O-benzoyl-β-D-ribofuranosyl)-3-quinolinecarboxylate

Ethyl 6-chloro-1,4-dihydro-4-oxo-1-(2,3,5-tri-O-benzoyl-β-D-ribofuranosyl)-3-quinolinecarboxylate

Ethyl 7-chloro-1,4-dihydro-4-oxo-1-(2,3,5-tri-O-benzoyl-β-D-ribofuranosyl)-3-quinolinecarboxylate