核苷是糖胺，可以被认为是不含磷酸基的核苷酸。核苷由一个核苷酸(也称为氮基)和一个五碳糖(核糖或脱氧核糖)组成，而核苷酸由一个核苷酸、一个五碳糖和一个或多个磷酸基组成。在核苷中，碱基通过-糖苷键与核糖或脱氧核糖结合。核苷酸是有机分子，是构成核酸聚合物的单体单位，脱氧核糖核酸(DNA)和核糖核酸(RNA)，两者都是地球上所有生命形式中必不可少的生物分子。核苷酸是核酸的基本组成部分;它们由三个亚基分子组成:一个氮基、一个五碳糖(核糖或脱氧核糖)和至少一个磷酸基。核苷是含氮的碱和5碳的糖。因此，一个核苷加上一个磷酸基产生一个核苷酸。
((2R,3S,4R,5R)-5-(6-Amino-9H-purin-9-yl)-3,4-dihydroxytetrahydrofuran-2-yl)methyl dihydrogen phosphate xsodium salt
Sodium ((2R,3S,4R,5R)-5-(2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl)-3,4-dihydroxytetrahydrofuran-2-yl)methyl hydrogen diphosphate
(2R,3S,4R,5R)-2-(Hydroxymethyl)-5-(6-(methylthio)-9H-purin-9-yl)tetrahydrofuran-3,4-diol
9-((2R,3R,4S,5R)-3,4-Dihydroxy-5-(hydroxymethyl)tetrahydrofuran-2-yl)-9H-purine-2,6-diol
Sodium ((2R,3S,4R,5R)-5-(2,6-dihydroxy-9H-purin-9-yl)-3,4-dihydroxytetrahydrofuran-2-yl)methyl phosphate
((2R,3S,4R,5R)-5-(2-Amino-6-oxo-1H-purin-9(6H)-yl)-3,4-dihydroxytetrahydrofuran-2-yl)methyl dihydrogen phosphate
5-Methylcyclocytidine hydrochloride
(2R,3R,4R,5R)-5-(4-Benzamido-2-oxopyrimidin-1(2H)-yl)-2-((bis(4-methoxyphenyl)(phenyl)methoxy)methyl)-4-fluorotetrahydrofuran-3-yl (2-cyanoethyl) diisopropylphosphoramidite
9-((2R,4S,5R)-5-((Bis(4-methoxyphenyl)(phenyl)methoxy)methyl)-4-hydroxytetrahydrofuran-2-yl)-9H-purin-6-ol
N-(9-((2R,3R,4S,5R)-5-((Bis(4-methoxyphenyl)(phenyl)methoxy)methyl)-3,4-dihydroxytetrahydrofuran-2-yl)-9H-purin-6-yl)benzamide
N-(9-((2R,3R,4S,5R)-5-((Bis(4-methoxyphenyl)(phenyl)methoxy)methyl)-4-((tert-butyldimethylsilyl)oxy)-3-hydroxytetrahydrofuran-2-yl)-9H-purin-6-yl)benzamide
N'-(9-((2R,4S,5R)-4-Hydroxy-5-(hydroxymethyl)tetrahydrofuran-2-yl)-6-oxo-6,9-dihydro-1H-purin-2-yl)-N,N-dimethylformimidamide
N-(9-((2R,3R,4R,5R)-4-Hydroxy-5-(hydroxymethyl)-3-methoxytetrahydrofuran-2-yl)-9H-purin-6-yl)benzamide
N-(1-((2R,3R,4R,5R)-4-Hydroxy-5-(hydroxymethyl)-3-methoxytetrahydrofuran-2-yl)-2-oxo-1,2-dihydropyrimidin-4-yl)acetamide
N-(9-((2R,3R,4R,5R)-3-Fluoro-4-hydroxy-5-(hydroxymethyl)tetrahydrofuran-2-yl)-9H-purin-6-yl)benzamide
N-(1-((2R,3R,4R,5R)-3-Fluoro-4-hydroxy-5-(hydroxymethyl)tetrahydrofuran-2-yl)-2-oxo-1,2-dihydropyrimidin-4-yl)acetamide
N-(9-((2R,3R,4R,5R)-3-((tert-Butyldimethylsilyl)oxy)-4-hydroxy-5-(hydroxymethyl)tetrahydrofuran-2-yl)-9H-purin-6-yl)benzamide
TFA-ap-dU
1-((2R,3R,4S,5R)-3,4-Dihydroxy-5-(hydroxymethyl)tetrahydrofuran-2-yl)-5-ethynylpyrimidine-2,4(1H,3H)-dione
1-((2R,3R,4S,5R)-3,4-Dihydroxy-5-(hydroxymethyl)tetrahydrofuran-2-yl)pyrimidin-2(1H)-one
1-((2R,3R,4S,5R)-5-((((((((2R,3S,4R,5R)-5-(6-Amino-9H-purin-9-yl)-3,4-dihydroxytetrahydrofuran-2-yl)methoxy)(hydroxy)phosphoryl)oxy)oxidophosphoryl)oxy)methyl)-3,4-dihydroxytetrahydrofuran-2-yl)-3-carbamoylpyridin-1-ium
3',5'-TIPS-N-Ac-Cytidine
4-Amino-5-chloro-1-((2R,4S,5R)-4-hydroxy-5-(hydroxymethyl)tetrahydrofuran-2-yl)pyrimidin-2(1H)-one
(2R,3R,4S,5R)-2-(6-Amino-2-methyl-9H-purin-9-yl)-5-(hydroxymethyl)tetrahydrofuran-3,4-diol
(2R,3S,4R,5R)-2-(Hydroxymethyl)-5-(6-methoxy-9H-purin-9-yl)tetrahydrofuran-3,4-diol
(2R,3S,4R,5R)-2-(6-Amino-9H-purin-9-yl)-4-fluoro-5-(hydroxymethyl)tetrahydrofuran-3-ol
(2R,3S,4R,5R)-2-(Hydroxymethyl)-5-(6-((3-methylbut-2-en-1-yl)amino)-2-(methylthio)-9H-purin-9-yl)tetrahydrofuran-3,4-diol
1-((2R,5S)-5-(Hydroxymethyl)tetrahydrofuran-2-yl)pyrimidine-2,4(1H,3H)-dione
Thymidine 5′-(tetrahydrogen triphosphate) xsodium salt
