摩熵化学
数据库官网
小程序
打开微信扫一扫
首页 分子通 化学资讯 化学百科 反应查询 关于我们
请输入关键词

核苷、核苷酸和类似物

中文名称 英文名称 CAS号 化学式 结构式图片
—— [(4R,6R)-4-(3-carbamoyl-1,2,4-triazol-1-yl)-2-phenyl-3a,4,6,6a-tetrahydrofuro[3,4-d][1,3]dioxol-6-yl]methyl 2-(dimethylamino)ethyl carbonate —— C20H25N5O7
[(4R,6R)-4-(3-carbamoyl-1,2,4-triazol-1-yl)-2-phenyl-3a,4,6,6a-tetrahydrofuro[3,4-d][1,3]dioxol-6-yl]methyl 2-(dimethylamino)ethyl carbonate
—— 2-[1-[11-[2-[4-carboxy-3-(3-hydroxy-6-oxoxanthen-9-yl)benzoyl]hydrazinyl]-11-oxoundecyl]-2,5-dihydroxypyrrol-3-yl]sulfanylethoxy-hydroxy-[[(2R,5R)-3-hydroxy-5-(5-methyl-2,4-dioxopyrimidin-1-yl)oxolan-2-yl]methoxy]-methoxyphosphanium —— C49H57N5O17PS+
2-[1-[11-[2-[4-carboxy-3-(3-hydroxy-6-oxoxanthen-9-yl)benzoyl]hydrazinyl]-11-oxoundecyl]-2,5-dihydroxypyrrol-3-yl]sulfanylethoxy-hydroxy-[[(2R,5R)-3-hydroxy-5-(5-methyl-2,4-dioxopyrimidin-1-yl)oxolan-2-yl]methoxy]-methoxyphosphanium
—— [5-(5-Fluoro-2,4-dioxopyrimidin-1-yl)-2-(hydroxymethyl)oxolan-3-yl] 5-methylsulfanyl-4-oxopentanoate —— C15H19FN2O7S
[5-(5-Fluoro-2,4-dioxopyrimidin-1-yl)-2-(hydroxymethyl)oxolan-3-yl] 5-methylsulfanyl-4-oxopentanoate
—— [(2R,3S,4R,5R)-5-(6-aminopurin-9-yl)-4-hydroxy-3-sulfooxyoxolan-2-yl]methyl (2S)-2-amino-4-methylsulfanylbutanoate —— C15H22N6O8S2
[(2R,3S,4R,5R)-5-(6-aminopurin-9-yl)-4-hydroxy-3-sulfooxyoxolan-2-yl]methyl (2S)-2-amino-4-methylsulfanylbutanoate
—— [(2R,3R,5R)-3,4-dibenzoyloxy-5-(1,2,4-triazol-1-yl)oxolan-2-yl]methyl benzoate —— C28H23N3O7
[(2R,3R,5R)-3,4-dibenzoyloxy-5-(1,2,4-triazol-1-yl)oxolan-2-yl]methyl benzoate
—— [4-(6-Benzamidopurin-9-yl)-2,2-dioxo-3a,4,6,6a-tetrahydrofuro[3,4-d][1,3,2]dioxathiol-6-yl]methyl benzoate —— C24H19N5O8S
[4-(6-Benzamidopurin-9-yl)-2,2-dioxo-3a,4,6,6a-tetrahydrofuro[3,4-d][1,3,2]dioxathiol-6-yl]methyl benzoate
—— 9-[(2R,4S,5R)-4-[tert-butyl(dimethyl)silyl]oxy-5-[[tert-butyl(dimethyl)silyl]oxymethyl]oxolan-2-yl]-6-[(2-nitrophenyl)methoxy]purin-2-amine —— C29H46N6O6Si2
9-[(2R,4S,5R)-4-[tert-butyl(dimethyl)silyl]oxy-5-[[tert-butyl(dimethyl)silyl]oxymethyl]oxolan-2-yl]-6-[(2-nitrophenyl)methoxy]purin-2-amine
—— [(2S,5R)-5-[2-oxo-4-(2,2,2-trichloroethoxycarbonylamino)pyrimidin-1-yl]oxolan-2-yl]methyl docosa-4,7,10,13,16,19-hexaenoate —— C34H44Cl3N3O6
[(2S,5R)-5-[2-oxo-4-(2,2,2-trichloroethoxycarbonylamino)pyrimidin-1-yl]oxolan-2-yl]methyl docosa-4,7,10,13,16,19-hexaenoate
—— 2-benzyl-N-[1-[2-(hydroxymethyl)-1,3-dioxolan-4-yl]-2-oxopyrimidin-4-yl]hexanamide —— C21H27N3O5
2-benzyl-N-[1-[2-(hydroxymethyl)-1,3-dioxolan-4-yl]-2-oxopyrimidin-4-yl]hexanamide
—— 2-amino-9-[(2R,3S,5R)-4-hydroxy-5-(hydroxymethyl)-3-(2-methoxyethoxy)thiolan-2-yl]-2,3-dihydro-1H-purin-6-one —— C13H21N5O5S
2-amino-9-[(2R,3S,5R)-4-hydroxy-5-(hydroxymethyl)-3-(2-methoxyethoxy)thiolan-2-yl]-2,3-dihydro-1H-purin-6-one
—— (2R,3S,5R)-2-(1-aminopentylperoxymethyl)-5-(6-aminopurin-9-yl)oxolan-3-ol —— C15H24N6O4
(2R,3S,5R)-2-(1-aminopentylperoxymethyl)-5-(6-aminopurin-9-yl)oxolan-3-ol
—— 2-amino-N-[3-[1-[4-hydroxy-5-(phosphorosomethyl)oxolan-2-yl]-2,4-dioxopyrimidin-5-yl]prop-2-enyl]-3-(1H-imidazol-5-yl)propanamide —— C18H23N6O6P
2-amino-N-[3-[1-[4-hydroxy-5-(phosphorosomethyl)oxolan-2-yl]-2,4-dioxopyrimidin-5-yl]prop-2-enyl]-3-(1H-imidazol-5-yl)propanamide
—— 4-Amino-5-(2-aminopropylsulfanylmethyl)-1-[4-hydroxy-5-(hydroxymethyl)oxolan-2-yl]pyrimidin-2-one —— C13H22N4O4S
4-Amino-5-(2-aminopropylsulfanylmethyl)-1-[4-hydroxy-5-(hydroxymethyl)oxolan-2-yl]pyrimidin-2-one
—— (4S)-2-[6-[(5-fluorooxolan-3-yl)amino]purin-9-yl]-5-[2-(2-fluorophenyl)ethyl]oxolane-3,4-diol —— C21H23F2N5O4
(4S)-2-[6-[(5-fluorooxolan-3-yl)amino]purin-9-yl]-5-[2-(2-fluorophenyl)ethyl]oxolane-3,4-diol
—— 1-[(4R,6R)-6-(hydroxymethyl)-2,2-dimethyl-3a,4,6,6a-tetrahydrofuro[3,4-d][1,3]dioxol-4-yl]-1,2,4-triazole-3-carboxamide;1-[(6R,8R)-8-(hydroxymethyl)-3-methyl-2,4-dioxo-5a,6,8,8a-tetrahydrofuro[3,4-b][1,4]dioxepin-6-yl]-1,2,4-triazole-3-carboxamide —— C23H30N8O12
1-[(4R,6R)-6-(hydroxymethyl)-2,2-dimethyl-3a,4,6,6a-tetrahydrofuro[3,4-d][1,3]dioxol-4-yl]-1,2,4-triazole-3-carboxamide;1-[(6R,8R)-8-(hydroxymethyl)-3-methyl-2,4-dioxo-5a,6,8,8a-tetrahydrofuro[3,4-b][1,4]dioxepin-6-yl]-1,2,4-triazole-3-carboxamide
—— (2R,3S,4R,5R)-2-[2-azido-6-(cyclopropylmethylamino)purin-9-yl]-5-(hydroxymethyl)oxolane-3,4-diol —— C14H18N8O4
(2R,3S,4R,5R)-2-[2-azido-6-(cyclopropylmethylamino)purin-9-yl]-5-(hydroxymethyl)oxolane-3,4-diol
—— 3-Ethyl-4-fluoro-5-(6-methylpurin-9-yl)oxolane-2-carbaldehyde —— C13H15FN4O2
3-Ethyl-4-fluoro-5-(6-methylpurin-9-yl)oxolane-2-carbaldehyde
—— (2R,3R,4S)-4-[(2R,5R)-5-(6-aminopurin-9-yl)-4-hydroxy-2-(hydroxymethyl)oxolan-3-yl]oxy-2-(hydroxymethyl)oxolane-3,4-diol —— C15H21N5O8
(2R,3R,4S)-4-[(2R,5R)-5-(6-aminopurin-9-yl)-4-hydroxy-2-(hydroxymethyl)oxolan-3-yl]oxy-2-(hydroxymethyl)oxolane-3,4-diol
—— [6-amino-9-[(2R,5R)-3,4-dihydroxy-5-(hydroxymethyl)oxolan-2-yl]purin-8-yl]phosphonic acid —— C10H14N5O7P
[6-amino-9-[(2R,5R)-3,4-dihydroxy-5-(hydroxymethyl)oxolan-2-yl]purin-8-yl]phosphonic acid
—— [[(2R,5R)-5-(6-amino-2-oxo-1H-purin-9-yl)-3-hydroxyoxolan-2-yl]methoxy-hydroxyphosphoryl] phosphono hydrogen phosphate —— C10H16N5O13P3
[[(2R,5R)-5-(6-amino-2-oxo-1H-purin-9-yl)-3-hydroxyoxolan-2-yl]methoxy-hydroxyphosphoryl] phosphono hydrogen phosphate
—— (2R,5R)-2-(6-aminopurin-9-yl)-5-(2-bromo-2-fluoroethenyl)oxolane-3,4-diol —— C11H11BrFN5O3
(2R,5R)-2-(6-aminopurin-9-yl)-5-(2-bromo-2-fluoroethenyl)oxolane-3,4-diol
—— [3-Benzoyloxy-5-[2,4-dioxo-5-(trifluoromethyl)pyrimidin-1-yl]oxolan-2-yl]methyl benzoate;ethane —— C28H31F3N2O7
[3-Benzoyloxy-5-[2,4-dioxo-5-(trifluoromethyl)pyrimidin-1-yl]oxolan-2-yl]methyl benzoate;ethane
—— [[(3R)-5-(2,4-dioxopyrimidin-1-yl)-3,4-dihydroxyoxolan-2-yl]methoxy-hydroxyphosphoryl] [(2R,3R,4S,5R,6R)-6-[4-(2,5-dioxopyrrol-1-yl)butoxyiminomethyl]-3,4,5-trihydroxyoxan-2-yl] hydrogen phosphate —— C23H32N4O19P2
[[(3R)-5-(2,4-dioxopyrimidin-1-yl)-3,4-dihydroxyoxolan-2-yl]methoxy-hydroxyphosphoryl] [(2R,3R,4S,5R,6R)-6-[4-(2,5-dioxopyrrol-1-yl)butoxyiminomethyl]-3,4,5-trihydroxyoxan-2-yl] hydrogen phosphate
—— (2S,3S,4R,5R)-5-[6-amino-2-[2-(3,4-dihydropyran-2-ylidenemethyl)hydrazinyl]purin-9-yl]-N-ethyl-3,4-dihydroxyoxolane-2-carboxamide —— C18H24N8O5
(2S,3S,4R,5R)-5-[6-amino-2-[2-(3,4-dihydropyran-2-ylidenemethyl)hydrazinyl]purin-9-yl]-N-ethyl-3,4-dihydroxyoxolane-2-carboxamide
—— ethane;oxolan-3-yl 4-[3-[6-amino-9-[(2R,4R,5S)-5-(ethylcarbamoyl)-3,4-dihydroxyoxolan-2-yl]purin-2-yl]prop-2-ynyl]piperidine-1-carboxylate —— C27H39N7O7
ethane;oxolan-3-yl 4-[3-[6-amino-9-[(2R,4R,5S)-5-(ethylcarbamoyl)-3,4-dihydroxyoxolan-2-yl]purin-2-yl]prop-2-ynyl]piperidine-1-carboxylate
—— 2-[1-[6-[3-carboxy-4-(3-hydroxy-6-oxoxanthen-9-yl)anilino]-6-oxohexyl]-2,5-dihydroxypyrrol-3-yl]sulfanylethoxy-hydroxy-[[(2R,5R)-3-hydroxy-5-(5-methyl-2,4-dioxopyrimidin-1-yl)oxolan-2-yl]methoxy]-methoxyphosphanium —— C43H46N4O16PS+
2-[1-[6-[3-carboxy-4-(3-hydroxy-6-oxoxanthen-9-yl)anilino]-6-oxohexyl]-2,5-dihydroxypyrrol-3-yl]sulfanylethoxy-hydroxy-[[(2R,5R)-3-hydroxy-5-(5-methyl-2,4-dioxopyrimidin-1-yl)oxolan-2-yl]methoxy]-methoxyphosphanium
—— 1-[4-Hydroxy-5-(hydroxymethyl)thiolan-2-yl]-5-methyl-3-[2-[2-(1-propyltriazol-4-yl)ethoxy]ethyl]pyrimidine-2,4-dione —— C19H29N5O5S
1-[4-Hydroxy-5-(hydroxymethyl)thiolan-2-yl]-5-methyl-3-[2-[2-(1-propyltriazol-4-yl)ethoxy]ethyl]pyrimidine-2,4-dione
—— 4-[(2S)-2-amino-3-[[(2R,3R,4S,5R)-2-(4-amino-2-oxopyrimidin-1-yl)-4-hydroxy-5-[[hydroxy-[hydroxy(phosphonooxy)phosphoryl]oxyphosphoryl]oxymethyl]oxolan-3-yl]amino]propyl]imidazole-1-carboxylic acid —— C16H26N7O15P3
4-[(2S)-2-amino-3-[[(2R,3R,4S,5R)-2-(4-amino-2-oxopyrimidin-1-yl)-4-hydroxy-5-[[hydroxy-[hydroxy(phosphonooxy)phosphoryl]oxyphosphoryl]oxymethyl]oxolan-3-yl]amino]propyl]imidazole-1-carboxylic acid
—— 9-[(2R,4S,5R)-4-hydroxy-5-(hydroxymethyl)oxolan-2-yl]-2-(2-hydroxy-5-pyridin-3-ylpyrrolidin-1-yl)-1H-purin-6-one —— C19H22N6O5
9-[(2R,4S,5R)-4-hydroxy-5-(hydroxymethyl)oxolan-2-yl]-2-(2-hydroxy-5-pyridin-3-ylpyrrolidin-1-yl)-1H-purin-6-one
—— [3,4-Dihydroxy-5-(5-methoxybenzimidazol-1-yl)oxolan-2-yl]methyl dihydrogen phosphate —— C13H17N2O8P
[3,4-Dihydroxy-5-(5-methoxybenzimidazol-1-yl)oxolan-2-yl]methyl dihydrogen phosphate
—— 2-[(2S,3S,4R,5R)-5-(6-aminopurin-9-yl)-3,4-dihydroxyoxolan-2-yl]-N-[2-[4-(diethoxyphosphorylmethyl)anilino]-2-oxoethyl]-2-hydroxyacetamide —— C24H32N7O9P
2-[(2S,3S,4R,5R)-5-(6-aminopurin-9-yl)-3,4-dihydroxyoxolan-2-yl]-N-[2-[4-(diethoxyphosphorylmethyl)anilino]-2-oxoethyl]-2-hydroxyacetamide
—— 4-amino-1-[(2S,5R)-4-azido-5-[[tert-butyl(dimethyl)silyl]oxymethyl]oxolan-2-yl]-5-fluoropyrimidin-2-one —— C15H25FN6O3Si
4-amino-1-[(2S,5R)-4-azido-5-[[tert-butyl(dimethyl)silyl]oxymethyl]oxolan-2-yl]-5-fluoropyrimidin-2-one
—— 2-[1-[6-(benzylamino)-9-[(2R,3R,4S,5R)-3,4-dihydroxy-5-(hydroxymethyl)oxolan-2-yl]purin-2-yl]pyrazol-4-yl]acetamide —— C22H24N8O5
2-[1-[6-(benzylamino)-9-[(2R,3R,4S,5R)-3,4-dihydroxy-5-(hydroxymethyl)oxolan-2-yl]purin-2-yl]pyrazol-4-yl]acetamide
—— 2-[(2S,3S,4R,5R)-5-[2-[2-(4-acetylphenyl)ethynyl]-6-(methoxyamino)purin-9-yl]-3,4-dihydroxyoxolan-2-yl]acetamide —— C22H22N6O6
2-[(2S,3S,4R,5R)-5-[2-[2-(4-acetylphenyl)ethynyl]-6-(methoxyamino)purin-9-yl]-3,4-dihydroxyoxolan-2-yl]acetamide
—— 1-[(6aS,9aS)-9-oxo-2,2,4,4-tetra(propan-2-yl)-6a,9a-dihydro-6H-furo[3,2-f][1,3,5,2,4]trioxadisilocin-8-yl]-1,2,4-triazole-3-carboxamide —— C20H36N4O6Si2
1-[(6aS,9aS)-9-oxo-2,2,4,4-tetra(propan-2-yl)-6a,9a-dihydro-6H-furo[3,2-f][1,3,5,2,4]trioxadisilocin-8-yl]-1,2,4-triazole-3-carboxamide
—— (2R,5R)-5-(6-amino-8-fluoropurin-9-yl)-2-(hydroxymethyl)oxolan-3-ol —— C10H12FN5O3
(2R,5R)-5-(6-amino-8-fluoropurin-9-yl)-2-(hydroxymethyl)oxolan-3-ol
—— [1-azido-3-decoxy-4-dodecoxy-1-[(2S,5R)-5-(5-methyl-2,4-dioxopyrimidin-1-yl)oxolan-2-yl]butyl] dihydrogen phosphate —— C35H64N5O9P
[1-azido-3-decoxy-4-dodecoxy-1-[(2S,5R)-5-(5-methyl-2,4-dioxopyrimidin-1-yl)oxolan-2-yl]butyl] dihydrogen phosphate
—— [(2R,5R)-5-(6-aminopurin-9-yl)-3,4-dihydroxyoxolan-2-yl]methyl 2-diethylphosphanylacetate —— C16H24N5O5P
[(2R,5R)-5-(6-aminopurin-9-yl)-3,4-dihydroxyoxolan-2-yl]methyl 2-diethylphosphanylacetate
—— N-[1-(3,4-dihydroxy-5-methyloxolan-2-yl)-5-fluoro-3-methyl-2-oxopyrimidin-1-ium-4-yl]-N'-hydroxyoctanediamide —— C18H28FN4O7+
N-[1-(3,4-dihydroxy-5-methyloxolan-2-yl)-5-fluoro-3-methyl-2-oxopyrimidin-1-ium-4-yl]-N'-hydroxyoctanediamide
—— Ethyl 1-[3,4-dibenzoyloxy-5-(benzoyloxymethyl)oxolan-2-yl]pyrimidin-1-ium-5-carboxylate —— C33H29N2O9+
Ethyl 1-[3,4-dibenzoyloxy-5-(benzoyloxymethyl)oxolan-2-yl]pyrimidin-1-ium-5-carboxylate
—— (3aR,4R,6S,6aR)-4-[6-amino-2-[2-[[(2R)-3,4-dihydro-2H-pyran-2-yl]methyl]hydrazinyl]purin-9-yl]-N-ethyl-2-hydroxy-2-oxo-3a,4,6,6a-tetrahydrofuro[3,4-d][1,3,2]dioxaphosphole-6-carboxamide —— C18H25N8O7P
(3aR,4R,6S,6aR)-4-[6-amino-2-[2-[[(2R)-3,4-dihydro-2H-pyran-2-yl]methyl]hydrazinyl]purin-9-yl]-N-ethyl-2-hydroxy-2-oxo-3a,4,6,6a-tetrahydrofuro[3,4-d][1,3,2]dioxaphosphole-6-carboxamide
—— 3-[[(2R,4S,5R)-5-(2,4-dioxopyrimidin-1-yl)-2-(methoxymethyl)-4-methyloxolan-3-yl]oxy-[di(propan-2-yl)amino]phosphanyl]oxypropanenitrile;3-[[di(propan-2-yl)amino]-[(2R,4S,5R)-2-(methoxymethyl)-4-methyl-5-(4-methyl-2-oxopyrimidin-1-yl)oxolan-3-yl]oxyphosphanyl]oxypropanenitrile —— C41H68N8O11P2
3-[[(2R,4S,5R)-5-(2,4-dioxopyrimidin-1-yl)-2-(methoxymethyl)-4-methyloxolan-3-yl]oxy-[di(propan-2-yl)amino]phosphanyl]oxypropanenitrile;3-[[di(propan-2-yl)amino]-[(2R,4S,5R)-2-(methoxymethyl)-4-methyl-5-(4-methyl-2-oxopyrimidin-1-yl)oxolan-3-yl]oxyphosphanyl]oxypropanenitrile
—— 4-(6-Aminopurin-9-yl)-2,2-dimethyl-3a,4,6,6a-tetrahydrofuro[3,4-d][1,3]dioxole-6-carboxylate —— C13H14N5O5-
4-(6-Aminopurin-9-yl)-2,2-dimethyl-3a,4,6,6a-tetrahydrofuro[3,4-d][1,3]dioxole-6-carboxylate
—— [(2R,5R)-3-hydroxy-5-(5-methyl-2,4-dioxopyrimidin-1-yl)oxolan-2-yl]methyl 2,4,6-trimethylbenzenesulfonate —— C19H24N2O7S
[(2R,5R)-3-hydroxy-5-(5-methyl-2,4-dioxopyrimidin-1-yl)oxolan-2-yl]methyl 2,4,6-trimethylbenzenesulfonate
—— [(2R,5R)-3-hydroxy-5-(5-methyl-2,4-dioxopyrimidin-1-yl)oxolan-2-yl]methyl 2-(3-benzoylphenyl)propanoate —— C26H26N2O7
[(2R,5R)-3-hydroxy-5-(5-methyl-2,4-dioxopyrimidin-1-yl)oxolan-2-yl]methyl 2-(3-benzoylphenyl)propanoate
—— 3-[3-(aminomethyl)phenyl]-N-[3-[1-[4-hydroxy-5-(tritiophosphanyloxymethyl)oxolan-2-yl]-2,4-dioxopyrimidin-5-yl]prop-2-enyl]prop-2-enamide —— C22H27N4O6P
3-[3-(aminomethyl)phenyl]-N-[3-[1-[4-hydroxy-5-(tritiophosphanyloxymethyl)oxolan-2-yl]-2,4-dioxopyrimidin-5-yl]prop-2-enyl]prop-2-enamide
—— 4-[[7-[2,5-dihydroxy-3-[2-[hydroxy-[[(2R,3R,5R)-3-hydroxy-5-(5-methyl-2,4-dioxopyrimidin-1-yl)oxolan-2-yl]methoxy]phosphoryl]oxyethylsulfanyl]pyrrol-1-yl]heptanoylamino]carbamoyl]-2-(3-hydroxy-6-oxoxanthen-9-yl)benzoic acid —— C44H46N5O17PS
4-[[7-[2,5-dihydroxy-3-[2-[hydroxy-[[(2R,3R,5R)-3-hydroxy-5-(5-methyl-2,4-dioxopyrimidin-1-yl)oxolan-2-yl]methoxy]phosphoryl]oxyethylsulfanyl]pyrrol-1-yl]heptanoylamino]carbamoyl]-2-(3-hydroxy-6-oxoxanthen-9-yl)benzoic acid
—— 1-[(2R,3R,4R,5R)-4-hydroxy-3-methoxy-5-(methylaminooxymethyl)oxolan-2-yl]pyrimidine-2,4-dione —— C11H17N3O6
1-[(2R,3R,4R,5R)-4-hydroxy-3-methoxy-5-(methylaminooxymethyl)oxolan-2-yl]pyrimidine-2,4-dione
—— [2-[(3aR,4R,6S,6aS)-4-(6-amino-2-phosphonopurin-9-yl)-2,2-dimethyl-3a,4,6,6a-tetrahydrofuro[3,4-d][1,3]dioxol-6-yl]-2-oxoethyl]-trihydroxyphosphanium —— C14H20N5O10P2+
[2-[(3aR,4R,6S,6aS)-4-(6-amino-2-phosphonopurin-9-yl)-2,2-dimethyl-3a,4,6,6a-tetrahydrofuro[3,4-d][1,3]dioxol-6-yl]-2-oxoethyl]-trihydroxyphosphanium
—— 1-[(2S,5S)-3-hydroxy-5-(hydroxymethyl)-4-(2-iodoethenoxy)oxolan-2-yl]pyrimidine-2,4-dione —— C11H13IN2O6
1-[(2S,5S)-3-hydroxy-5-(hydroxymethyl)-4-(2-iodoethenoxy)oxolan-2-yl]pyrimidine-2,4-dione