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嘧啶核苷

中文名称 英文名称 CAS号 化学式 结构式图片
—— 3 inverted exclamation mark-O-Methyl-5-methyluridine —— C11H16N2O6
3 inverted exclamation mark-O-Methyl-5-methyluridine
—— 4-[(2R,3S,5R)-4-methoxy-5-(methoxymethyl)-2-(5-methyl-2,4-dioxopyrimidin-1-yl)oxolan-3-yl]oxy-4-oxobutanoic acid —— C16H22N2O9
4-[(2R,3S,5R)-4-methoxy-5-(methoxymethyl)-2-(5-methyl-2,4-dioxopyrimidin-1-yl)oxolan-3-yl]oxy-4-oxobutanoic acid
—— 1-[(3R,4S,5R)-3-hydroxy-5-(hydroxymethyl)-4-methoxyoxolan-2-yl]pyrimidine-2,4-dione —— C10H14N2O6
1-[(3R,4S,5R)-3-hydroxy-5-(hydroxymethyl)-4-methoxyoxolan-2-yl]pyrimidine-2,4-dione
—— N4-Benzoyl-3 inverted exclamation mark-deoxycytidine —— C16H17N3O5
N4-Benzoyl-3 inverted exclamation mark-deoxycytidine
—— 3 inverted exclamation marka-O-Methylcytidine —— C10H15N3O5
3 inverted exclamation marka-O-Methylcytidine
—— 4-amino-1-[(3R,4R,5R)-3-hydroxy-5-(hydroxymethyl)-4-methoxyoxolan-2-yl]pyrimidin-2-one —— C10H15N3O5
4-amino-1-[(3R,4R,5R)-3-hydroxy-5-(hydroxymethyl)-4-methoxyoxolan-2-yl]pyrimidin-2-one
—— 1-[(2R,3S,5R)-3-hydroxy-5-(hydroxymethyl)-4-methoxyoxolan-2-yl]pyrimidine-2,4-dione —— C10H14N2O6
1-[(2R,3S,5R)-3-hydroxy-5-(hydroxymethyl)-4-methoxyoxolan-2-yl]pyrimidine-2,4-dione
—— N-[3-[(2R,4R,5R)-3,3-difluoro-4-hydroxy-5-(hydroxymethyl)oxolan-2-yl]-2-oxopyrimidin-4-yl]-3,4,5-trimethoxybenzamide —— C19H21F2N3O8
N-[3-[(2R,4R,5R)-3,3-difluoro-4-hydroxy-5-(hydroxymethyl)oxolan-2-yl]-2-oxopyrimidin-4-yl]-3,4,5-trimethoxybenzamide
—— [5-(4-Amino-2-oxopyrimidin-1-yl)-4,4-difluoro-3-hydroxyoxolan-2-yl]methyl 8-anilino-8-oxooctanoate —— C23H28F2N4O6
[5-(4-Amino-2-oxopyrimidin-1-yl)-4,4-difluoro-3-hydroxyoxolan-2-yl]methyl 8-anilino-8-oxooctanoate
—— 1-[(2R,4R,5R)-4-(8-anilino-8-oxooctanoyloxy)-3,3-difluoro-5-hydroxymethyloxolan-2-yl]-1,2-dihydro-4-(hexyloxycarbonylamino)pyrimidin-2-one 1609206-82-7 C30H40F2N4O8
1-[(2R,4R,5R)-4-(8-anilino-8-oxooctanoyloxy)-3,3-difluoro-5-hydroxymethyloxolan-2-yl]-1,2-dihydro-4-(hexyloxycarbonylamino)pyrimidin-2-one
—— [4,4-Difluoro-5-[4-(hexoxycarbonylamino)-2-oxopyrimidin-1-yl]-2-(hydroxymethyl)oxolan-3-yl] 8-anilino-8-oxooctanoate —— C30H40F2N4O8
[4,4-Difluoro-5-[4-(hexoxycarbonylamino)-2-oxopyrimidin-1-yl]-2-(hydroxymethyl)oxolan-3-yl] 8-anilino-8-oxooctanoate
—— [4,4-Difluoro-3-hydroxy-5-[2-oxo-4-(pentoxycarbonylamino)pyrimidin-1-yl]oxolan-2-yl]methyl 8-anilino-8-oxooctanoate —— C29H38F2N4O8
[4,4-Difluoro-3-hydroxy-5-[2-oxo-4-(pentoxycarbonylamino)pyrimidin-1-yl]oxolan-2-yl]methyl 8-anilino-8-oxooctanoate
—— 4-amino-1-[(2R,4R,5R)-5-((8-anilino-8-oxooctanoyloxy)methyl)-3,3-difluoro-4-hydroxyoxolan-2-yl]-1,2-dihydropyrimidin-2-one 1609206-05-4 C23H28F2N4O6
4-amino-1-[(2R,4R,5R)-5-((8-anilino-8-oxooctanoyloxy)methyl)-3,3-difluoro-4-hydroxyoxolan-2-yl]-1,2-dihydropyrimidin-2-one
—— 1-[(2R,4R,5R)-5-((8-anilino-8-oxooctanoyloxy)methyl)-3,3-difluoro-4-hydroxyoxolan-2-yl]-1,2-dihydro-4-(pentyloxycarbonylamino)pyrimidin-2-one 1609206-31-6 C29H38F2N4O8
1-[(2R,4R,5R)-5-((8-anilino-8-oxooctanoyloxy)methyl)-3,3-difluoro-4-hydroxyoxolan-2-yl]-1,2-dihydro-4-(pentyloxycarbonylamino)pyrimidin-2-one
—— [5-[4-(Butoxycarbonylamino)-2-oxopyrimidin-1-yl]-4,4-difluoro-3-hydroxyoxolan-2-yl]methyl 8-anilino-8-oxooctanoate —— C28H36F2N4O8
[5-[4-(Butoxycarbonylamino)-2-oxopyrimidin-1-yl]-4,4-difluoro-3-hydroxyoxolan-2-yl]methyl 8-anilino-8-oxooctanoate
—— 1-[(2R,4R,5R)-5-((8-anilino-8-oxooctanoyloxy)methyl)-3,3-difluoro-4-hydroxyoxolan-2-yl]-4-(butyloxycarbonylamino)-1,2-dihydropyrimidin-2-one 1609206-18-9 C28H36F2N4O8
1-[(2R,4R,5R)-5-((8-anilino-8-oxooctanoyloxy)methyl)-3,3-difluoro-4-hydroxyoxolan-2-yl]-4-(butyloxycarbonylamino)-1,2-dihydropyrimidin-2-one
—— 1-[(2R,4R,5R)-5-tert-butyldimethylsilyloxymethyl-3,3-difluoro-4-hydroxyoxolan-2-yl]-1,2-dihydro-4-(hexyloxycarbonylamino)pyrimidin-2-one 1609206-77-0 C22H37F2N3O6Si
1-[(2R,4R,5R)-5-tert-butyldimethylsilyloxymethyl-3,3-difluoro-4-hydroxyoxolan-2-yl]-1,2-dihydro-4-(hexyloxycarbonylamino)pyrimidin-2-one
—— ((2R,3R,5R)-3-(allyloxycarbonyloxy)-5-(4-(ethoxycarbonylamino)-2-oxopyrimidin-1(2H)-yl)-4,4-difluorotetrahydrofuran-2-yl)methyl 3-phenylpropanoate 1609206-95-2 C25H27F2N3O9
((2R,3R,5R)-3-(allyloxycarbonyloxy)-5-(4-(ethoxycarbonylamino)-2-oxopyrimidin-1(2H)-yl)-4,4-difluorotetrahydrofuran-2-yl)methyl 3-phenylpropanoate
—— 1-[(2R,4R,5R)-5-((8-anilino-8-oxooctanoyloxy)methyl)-3,3-difluoro-4-hydroxyoxolan-2-yl]-1,2-dihydro-4-(2-methoxyethyloxycarbonylamino)pyrimidin-2-one 1609206-52-1 C27H34F2N4O9
1-[(2R,4R,5R)-5-((8-anilino-8-oxooctanoyloxy)methyl)-3,3-difluoro-4-hydroxyoxolan-2-yl]-1,2-dihydro-4-(2-methoxyethyloxycarbonylamino)pyrimidin-2-one
—— 1-[(2R,4R,5R)-3,3-difluoro-5-hydroxymethyl-4-(3-(3-pyridyl)propanoyloxy)oxolan-2-yl]-1,2-dihydro-4-(hexyloxycarbonylamino)pyrimidin-2-one 1609206-79-2 C24H30F2N4O7
1-[(2R,4R,5R)-3,3-difluoro-5-hydroxymethyl-4-(3-(3-pyridyl)propanoyloxy)oxolan-2-yl]-1,2-dihydro-4-(hexyloxycarbonylamino)pyrimidin-2-one
—— 1-[(2R,4R,5R)-4-(4-anilino-4-oxobutanoyloxy)-3,3-difluoro-5-hydroxymethyloxolan-2-yl]-4-butyloxycarbonylamino-1,2-dihydropyrimidin-2-one 1609206-62-3 C24H28F2N4O8
1-[(2R,4R,5R)-4-(4-anilino-4-oxobutanoyloxy)-3,3-difluoro-5-hydroxymethyloxolan-2-yl]-4-butyloxycarbonylamino-1,2-dihydropyrimidin-2-one
—— 1-[(2R,4R,5R)-3,3-difluoro-5-hydroxymethyl-4-(3-phenylpropanoyloxy)oxolan-2-yl]-1,2-dihydro-4-(2-methylpropyloxycarbonylamino)pyrimidin-2-one 1609206-66-7 C23H27F2N3O7
1-[(2R,4R,5R)-3,3-difluoro-5-hydroxymethyl-4-(3-phenylpropanoyloxy)oxolan-2-yl]-1,2-dihydro-4-(2-methylpropyloxycarbonylamino)pyrimidin-2-one
—— 1-[(2R,4R,5R)-3,3-difluoro-5-hydroxymethyl-4-(3-phenylpropanoyloxy)oxolan-2-yl]-1,2-dihydro-4-(hexyloxycarbonylamino)pyrimidin-2-one 1609206-78-1 C25H31F2N3O7
1-[(2R,4R,5R)-3,3-difluoro-5-hydroxymethyl-4-(3-phenylpropanoyloxy)oxolan-2-yl]-1,2-dihydro-4-(hexyloxycarbonylamino)pyrimidin-2-one
—— 1-[(2R,4R,5R)-3,3-difluoro-5-hydroxymethyl-4-(3-phenylpropanoyloxy)tetrahydrofuran-2-yl]-1,2-dihydro-4-(pentyloxycarbonylamino)-pyrimidin-2-one 1609206-72-5 C24H29F2N3O7
1-[(2R,4R,5R)-3,3-difluoro-5-hydroxymethyl-4-(3-phenylpropanoyloxy)tetrahydrofuran-2-yl]-1,2-dihydro-4-(pentyloxycarbonylamino)-pyrimidin-2-one
—— 1-[(2R,4R,5R)-5-((4-anilino-4-oxobutanoyloxy)methyl)-3,3-difluoro-4-hydroxyoxolan-2-yl]-1,2-dihydro-4-(pentyloxycarbonylamino)pyrimidin-2-one 1609206-29-2 C25H30F2N4O8
1-[(2R,4R,5R)-5-((4-anilino-4-oxobutanoyloxy)methyl)-3,3-difluoro-4-hydroxyoxolan-2-yl]-1,2-dihydro-4-(pentyloxycarbonylamino)pyrimidin-2-one
—— 1-[(2R,4R,5R)-4-(6-anilino-6-oxohexanoyloxy)-3,3-difluoro-5-hydroxymethyloxolan-2-yl]-1,2-dihydro-4-(2-methoxyethyloxycarbonylamino)pyrimidin-2-one 1609206-92-9 C25H30F2N4O9
1-[(2R,4R,5R)-4-(6-anilino-6-oxohexanoyloxy)-3,3-difluoro-5-hydroxymethyloxolan-2-yl]-1,2-dihydro-4-(2-methoxyethyloxycarbonylamino)pyrimidin-2-one
—— 1-[(2R,4R,5R)-3,3-difluoro-5-hydroxymethyl-4-(3-(3-pyridyl)propanoyloxy)oxolan-2-yl]-1,2-dihydro-4-(heptyloxycarbonylamino)pyrimidin-2-one 1609206-85-0 C25H32F2N4O7
1-[(2R,4R,5R)-3,3-difluoro-5-hydroxymethyl-4-(3-(3-pyridyl)propanoyloxy)oxolan-2-yl]-1,2-dihydro-4-(heptyloxycarbonylamino)pyrimidin-2-one
—— 4-(butyloxycarbonylamino)-1-[(2R,4R,5R)-3,3-difluoro-4-hydroxy-5-(3-(3-pyridyl)propanoyloxymethyl)oxolan-2-yl]-1,2-dihydropyrimidin-2-one 1609206-15-6 C22H26F2N4O7
4-(butyloxycarbonylamino)-1-[(2R,4R,5R)-3,3-difluoro-4-hydroxy-5-(3-(3-pyridyl)propanoyloxymethyl)oxolan-2-yl]-1,2-dihydropyrimidin-2-one
—— [5-[4-(Butoxycarbonylamino)-2-oxopyrimidin-1-yl]-4,4-difluoro-3-hydroxyoxolan-2-yl]methyl 6-anilino-6-oxohexanoate —— C26H32F2N4O8
[5-[4-(Butoxycarbonylamino)-2-oxopyrimidin-1-yl]-4,4-difluoro-3-hydroxyoxolan-2-yl]methyl 6-anilino-6-oxohexanoate
—— 1-[(2R,4R,5R)-5-tert-butyldimethylsilyloxymethyl-3,3-difluoro-4-hydroxyoxolan-2-yl]-1,2-dihydro-4-(heptyloxycarbonylamino)pyrimidin-2-one 1609206-83-8 C23H39F2N3O6Si
1-[(2R,4R,5R)-5-tert-butyldimethylsilyloxymethyl-3,3-difluoro-4-hydroxyoxolan-2-yl]-1,2-dihydro-4-(heptyloxycarbonylamino)pyrimidin-2-one
—— 1-[(2R,4R,5R)-4-(4-anilino-4-oxobutanoyloxy)-3,3-difluoro-5-hydroxymethyloxolan-2-yl]-1,2-dihydro-4-(heptyloxycarbonylamino)pyrimidin-2-one 1609206-86-1 C27H34F2N4O8
1-[(2R,4R,5R)-4-(4-anilino-4-oxobutanoyloxy)-3,3-difluoro-5-hydroxymethyloxolan-2-yl]-1,2-dihydro-4-(heptyloxycarbonylamino)pyrimidin-2-one
—— 1-[(2R,4R,5R)-4-(8-anilino-8-oxooctanoyloxy)-3,3-difluoro-5-hydroxymethyloxolan-2-yl]-1,2-dihydro-4-(heptyloxycarbonylamino)pyrimidin-2-one 1609206-88-3 C31H42F2N4O8
1-[(2R,4R,5R)-4-(8-anilino-8-oxooctanoyloxy)-3,3-difluoro-5-hydroxymethyloxolan-2-yl]-1,2-dihydro-4-(heptyloxycarbonylamino)pyrimidin-2-one
—— 1-[(2R,4R,5R)-3,3-difluoro-4-hydroxy-5-(3-phenylpropanoyloxymethyl)oxolan-2-yl]-1,2-dihydro-4-(2-methoxyethyloxycarbonylamino)pyrimidin-2-one 1609206-48-5 C22H25F2N3O8
1-[(2R,4R,5R)-3,3-difluoro-4-hydroxy-5-(3-phenylpropanoyloxymethyl)oxolan-2-yl]-1,2-dihydro-4-(2-methoxyethyloxycarbonylamino)pyrimidin-2-one
—— 1-[(2R,4R,5R)-5-((6-anilino-6-oxohexanoyloxy)methyl)-3,3-difluoro-4-hydroxyoxolan-2-yl]-1,2-dihydro-4-(heptyloxycarbonylamino)pyrimidin-2-one 1609206-44-1 C29H38F2N4O8
1-[(2R,4R,5R)-5-((6-anilino-6-oxohexanoyloxy)methyl)-3,3-difluoro-4-hydroxyoxolan-2-yl]-1,2-dihydro-4-(heptyloxycarbonylamino)pyrimidin-2-one
—— 4-(butyloxycarbonylamino)-1-[(2R,4R,5R)-3,3-difluoro-4-hydroxy-5-(3-phenylpropanoyloxymethyl)oxolan-2-yl]-1,2-dihydropyrimidin-2-one 1609206-14-5 C23H27F2N3O7
4-(butyloxycarbonylamino)-1-[(2R,4R,5R)-3,3-difluoro-4-hydroxy-5-(3-phenylpropanoyloxymethyl)oxolan-2-yl]-1,2-dihydropyrimidin-2-one
—— [5-[4-(Ethoxycarbonylamino)-2-oxopyrimidin-1-yl]-4,4-difluoro-3-hydroxyoxolan-2-yl]methyl 8-anilino-8-oxooctanoate —— C26H32F2N4O8
[5-[4-(Ethoxycarbonylamino)-2-oxopyrimidin-1-yl]-4,4-difluoro-3-hydroxyoxolan-2-yl]methyl 8-anilino-8-oxooctanoate
—— 1-[(2R,4R,5R)-4-(6-anilino-6-oxohexanoyloxy)-3,3-difluoro-5-hydroxymethyloxolan-2-yl]-1,2-dihydro-4-(hexyloxycarbonylamino)pyrimidin-2-one 1609206-81-6 C28H36F2N4O8
1-[(2R,4R,5R)-4-(6-anilino-6-oxohexanoyloxy)-3,3-difluoro-5-hydroxymethyloxolan-2-yl]-1,2-dihydro-4-(hexyloxycarbonylamino)pyrimidin-2-one
—— 1-[(2R,4R,5R)-3,3-difluoro-4-hydroxy-5-(3-(3-pyridyl)propanoyloxymethyl)oxolan-2-yl]-1,2-dihydro-4-(ethoxycarbonylamino)pyrimidin-2-one 1609206-09-8 C20H22F2N4O7
1-[(2R,4R,5R)-3,3-difluoro-4-hydroxy-5-(3-(3-pyridyl)propanoyloxymethyl)oxolan-2-yl]-1,2-dihydro-4-(ethoxycarbonylamino)pyrimidin-2-one
—— ethyl 1-((2R,4R,5R)-4-(allyloxycarbonyloxy)-3,3-difluoro-5-(hydroxylmethyl)tetrahydrofuran-2-yl)-2-oxo-1,2-dihydropyrimidin-4-ylcarbamate 1609206-94-1 C16H19F2N3O8
ethyl 1-((2R,4R,5R)-4-(allyloxycarbonyloxy)-3,3-difluoro-5-(hydroxylmethyl)tetrahydrofuran-2-yl)-2-oxo-1,2-dihydropyrimidin-4-ylcarbamate
—— 1-[(2R,4R,5R)-4-(8-anilino-8-oxooctanoyloxy)-3,3-difluoro-5-hydroxymethyloxolan-2-yl]-1,2-dihydro-4-(2-methylpropyloxycarbonylamino)pyrimidin-2-one 1609206-70-3 C28H36F2N4O8
1-[(2R,4R,5R)-4-(8-anilino-8-oxooctanoyloxy)-3,3-difluoro-5-hydroxymethyloxolan-2-yl]-1,2-dihydro-4-(2-methylpropyloxycarbonylamino)pyrimidin-2-one
—— 1-[(2R,4R,5R)-4-(8-anilino-8-oxooctanoyloxy)-3,3-difluoro-5-hydroxymethyloxolan-2-yl]-1,2-dihydro-4-(pentyloxycarbonylamino)pyrimidin-2-one 1609206-76-9 C29H38F2N4O8
1-[(2R,4R,5R)-4-(8-anilino-8-oxooctanoyloxy)-3,3-difluoro-5-hydroxymethyloxolan-2-yl]-1,2-dihydro-4-(pentyloxycarbonylamino)pyrimidin-2-one
—— 1-[(2R,4R,5R)-5-((8-anilino-8-oxooctanoyloxy)methyl)-3,3-difluoro-4-hydroxyoxolan-2-yl]-1,2-dihydro-4-(ethoxycarbonylamino)pyrimidin-2-one 1609206-12-3 C26H32F2N4O8
1-[(2R,4R,5R)-5-((8-anilino-8-oxooctanoyloxy)methyl)-3,3-difluoro-4-hydroxyoxolan-2-yl]-1,2-dihydro-4-(ethoxycarbonylamino)pyrimidin-2-one
—— 1-[(2R,4R,5R)-3,3-difluoro-5-hydroxymethyl-4-(3-phenylpropanoyloxy)oxolan-2-yl]-1,2-dihydro-4-(heptyloxycarbonylamino)pyrimidin-2-one 1609206-84-9 C26H33F2N3O7
1-[(2R,4R,5R)-3,3-difluoro-5-hydroxymethyl-4-(3-phenylpropanoyloxy)oxolan-2-yl]-1,2-dihydro-4-(heptyloxycarbonylamino)pyrimidin-2-one
—— 1-[(2R,4R,5R)-3,3-difluoro-4-hydroxy-5-(3-phenylpropanoyloxymethyl)oxolan-2-yl]-1,2-dihydro-4-(heptyloxycarbonylamino)pyrimidin-2-one 1609206-41-8 C26H33F2N3O7
1-[(2R,4R,5R)-3,3-difluoro-4-hydroxy-5-(3-phenylpropanoyloxymethyl)oxolan-2-yl]-1,2-dihydro-4-(heptyloxycarbonylamino)pyrimidin-2-one
—— 1-[(2R,4R,5R)-3,3-difluoro-5-hydroxymethyl-4-(3-(3-pyridyl)propanoyloxy)oxolan-2-yl]-1,2-dihydro-4-(pentyloxycarbonylamino)pyrimidin-2-one 1609206-73-6 C23H28F2N4O7
1-[(2R,4R,5R)-3,3-difluoro-5-hydroxymethyl-4-(3-(3-pyridyl)propanoyloxy)oxolan-2-yl]-1,2-dihydro-4-(pentyloxycarbonylamino)pyrimidin-2-one
—— 1-[(2R,4R,5R)-3,3-difluoro-4-hydroxy-5-(3-phenylpropanoyloxymethyl)oxolan-2-yl]-1,2-dihydro-4-(pentyloxycarbonylamino)pyrimidin-2-one 1609206-27-0 C24H29F2N3O7
1-[(2R,4R,5R)-3,3-difluoro-4-hydroxy-5-(3-phenylpropanoyloxymethyl)oxolan-2-yl]-1,2-dihydro-4-(pentyloxycarbonylamino)pyrimidin-2-one
—— 1-[(2R,4R,5R)-3,3-difluoro-4-hydroxy-5-(3-(3-pyridyl)propanoyloxymethyl)oxolan-2-yl]-1,2-dihydro-4-(2-methylpropyloxycarbonylamino)pyrimidin-2-one 1609206-22-5 C22H26F2N4O7
1-[(2R,4R,5R)-3,3-difluoro-4-hydroxy-5-(3-(3-pyridyl)propanoyloxymethyl)oxolan-2-yl]-1,2-dihydro-4-(2-methylpropyloxycarbonylamino)pyrimidin-2-one
—— 1-[(2R,4R,5R)-5-((4-anilino-4-oxobutanoyloxy)methyl)-3,3-difluoro-4-hydroxyoxolan-2-yl]-4-(butyloxycarbonylamino)-1,2-dihydropyrimidin-2-one 1609206-16-7 C24H28F2N4O8
1-[(2R,4R,5R)-5-((4-anilino-4-oxobutanoyloxy)methyl)-3,3-difluoro-4-hydroxyoxolan-2-yl]-4-(butyloxycarbonylamino)-1,2-dihydropyrimidin-2-one
—— ((2R,3R,5R)-3-(allyloxycarbonyloxy)-5-(4-(ethoxycarbonylamino)-2-oxopyrimidin-1(2H)-yl)-4,4-difluorotetrahydrofuran-2-yl)methyl 8-oxo-8-(phenylamino)octanoate 1609206-98-5 C30H36F2N4O10
((2R,3R,5R)-3-(allyloxycarbonyloxy)-5-(4-(ethoxycarbonylamino)-2-oxopyrimidin-1(2H)-yl)-4,4-difluorotetrahydrofuran-2-yl)methyl 8-oxo-8-(phenylamino)octanoate
—— 1-[(2R,4R,5R)-4-(4-anilino-4-oxobutanoyloxy)-3,3-difluoro-5-hydroxymethyloxolan-2-yl]-1,2-dihydro-4-(ethoxycarbonylamino)pyrimidin-2-one 1609206-56-5 C22H24F2N4O8
1-[(2R,4R,5R)-4-(4-anilino-4-oxobutanoyloxy)-3,3-difluoro-5-hydroxymethyloxolan-2-yl]-1,2-dihydro-4-(ethoxycarbonylamino)pyrimidin-2-one