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。
1-((2R,4S,5S)-4-Amino-5-(hydroxymethyl)tetrahydrofuran-2-yl)-5-methylpyrimidine-2,4(1H,3H)-dione
N4-Benzoylcytidine
1-((2R,4S,5R)-4-Hydroxy-5-((trityloxy)methyl)tetrahydrofuran-2-yl)-5-methylpyrimidine-2,4(1H,3H)-dione
4-Amino-5-bromo-1-((2R,3R,4S,5R)-3,4-dihydroxy-5-(hydroxymethyl)tetrahydrofuran-2-yl)pyrimidin-2(1H)-one
(2S,3R,5S)-5-(4-Amino-5-iodo-7H-pyrrolo[2,3-d]pyrimidin-7-yl)-2-(hydroxymethyl)tetrahydrofuran-3-ol
2-Amino-7-((2R,4S,5R)-4-hydroxy-5-(hydroxymethyl)tetrahydrofuran-2-yl)-5-iodo-1H-pyrrolo[2,3-d]pyrimidin-4(7H)-one
(2R,3R,4S,5R)-2-(6-((Furan-2-ylmethyl)amino)-9H-purin-9-yl)-5-(hydroxymethyl)tetrahydrofuran-3,4-diol
(2R,3R,4S,5R)-2-(6-((2-Hydroxyethyl)amino)-9H-purin-9-yl)-5-(hydroxymethyl)tetrahydrofuran-3,4-diol
(2R,3R,4R,5R)-2-(Acetoxymethyl)-5-(6-amino-9H-purin-9-yl)tetrahydrofuran-3,4-diyl diacetate
5'-Chloro-5'-deoxyadenosine
Inosine 5'-monophosphate disodium salt xhydrate
(2R,3S,4S,5R)-2-(2-Amino-6-methoxy-9H-purin-9-yl)-5-(hydroxymethyl)tetrahydrofuran-3,4-diol
4-Amino-5-chloro-1-((2R,3R,4S,5R)-3,4-dihydroxy-5-(hydroxymethyl)tetrahydrofuran-2-yl)pyrimidin-2(1H)-one
(S)-2-Amino-4-((((2S,3S,4R,5R)-5-(6-amino-9H-purin-9-yl)-3,4-dihydroxytetrahydrofuran-2-yl)methyl)thio)butanoic acid
5-Ethyl-1-((2R,4S,5R)-4-hydroxy-5-(hydroxymethyl)tetrahydrofuran-2-yl)pyrimidine-2,4(1H,3H)-dione
(S)-2,6-Dioxohexahydropyrimidine-4-carboxylic acid
5-Ethynyl-2'-dU
1-((2R,3R,4S,5R)-3,4-Dihydroxy-5-methyltetrahydrofuran-2-yl)-5-fluoropyrimidine-2,4(1H,3H)-dione
(2R,3S,4S,5R)-2-(6-Amino-9H-purin-9-yl)-5-(hydroxymethyl)tetrahydrofuran-3,4-diol
Inosine-5'-monophosphate Disodium Salt octahydrate
(2R,3R,4S,5R)-5-(6-Amino-2-chloro-9H-purin-9-yl)-4-fluoro-2-(hydroxymethyl)tetrahydrofuran-3-ol
4-Amino-1-((2R,3S,4S,5R)-4-fluoro-3-hydroxy-5-(hydroxymethyl)tetrahydrofuran-2-yl)pyrimidin-2(1H)-one
(2R,3R,4R,5R)-2-(Acetoxymethyl)-5-(6-chloro-9H-purin-9-yl)tetrahydrofuran-3,4-diyl diacetate
5'-O-[Bis(4-methoxyphenyl)phenylmethyl]-adenosine
(2R,3R,4S,5R)-2-(6-(((R)-2,3-Dihydro-1H-inden-1-yl)amino)-9H-purin-9-yl)-5-(hydroxymethyl)tetrahydrofuran-3,4-diol
(2R,3S,5R)-5-(2,6-Diamino-9H-purin-9-yl)-2-(hydroxymethyl)tetrahydrofuran-3-ol
(2R,3R,4R,5R)-2-(5-Fluoro-2-oxo-4-(((pentyloxy)carbonyl)amino)pyrimidin-1(2H)-yl)-5-methyltetrahydrofuran-3,4-diyl diacetate
(2R,3R,4S,5S)-2-(6-Amino-9H-purin-9-yl)-5-((methylthio)methyl)tetrahydrofuran-3,4-diol
1-((2R,3R,4R,5R)-4-Hydroxy-5-(hydroxymethyl)-3-methoxytetrahydrofuran-2-yl)-5-iodopyrimidine-2,4(1H,3H)-dione
4-Amino-1-((2R,3R,4R,5R)-4-hydroxy-5-(hydroxymethyl)-3-methoxytetrahydrofuran-2-yl)-5-methylpyrimidin-2(1H)-one
