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,5R)-4-Hydroxy-5-((trityloxy)methyl)tetrahydrofuran-2-yl)pyrimidine-2,4(1H,3H)-dione
((2R,3S,4S,5R)-5-(6-Amino-2-fluoro-9H-purin-9-yl)-3,4-dihydroxytetrahydrofuran-2-yl)methyl dihydrogen phosphate
5'-O-Acetyl-2',3'-O-isopropylideneadenosine
(2R,3R,4S,5R)-2-(2-Chloro-6-methoxy-9H-purin-9-yl)-5-(hydroxymethyl)tetrahydrofuran-3,4-diol
1-((2R,3R,4S,5R)-3,4-Dihydroxy-5-(hydroxymethyl)tetrahydrofuran-2-yl)-5-methoxypyrimidine-2,4(1H,3H)-dione
(2R,3R,4S,5R)-2-(2-Chloro-6-(cyclopentylamino)-9H-purin-9-yl)-5-(hydroxymethyl)tetrahydrofuran-3,4-diol
Sodium ((2R,3S,4R,5R)-5-(6-amino-9H-purin-9-yl)-3,4-dihydroxytetrahydrofuran-2-yl)methyl phosphate
2'-Deoxy-2'-fluorocytidine hydrate
((2R,3R,5R)-5-(4-Amino-2-oxopyrimidin-1(2H)-yl)-4,4-difluoro-3-hydroxytetrahydrofuran-2-yl)methyl dihydrogen phosphate
4-Amino-5-ethynyl-1-((2R,4S,5R)-4-hydroxy-5-(hydroxymethyl)tetrahydrofuran-2-yl)pyrimidin-2(1H)-one
N-(2-Oxo-1,2-dihydropyrimidin-4-yl)acetamide
Guanosine 5'-(trihydrogen diphosphate) P'-D-mannopyranosyl ester disodium salt
(2R,3R,4S,5R)-2-(6-Amino-8-bromo-9H-purin-9-yl)-5-(hydroxymethyl)tetrahydrofuran-3,4-diol
2-Amino-8-bromo-9-((2R,3R,4S,5R)-3,4-dihydroxy-5-(hydroxymethyl)tetrahydrofuran-2-yl)-1H-purin-6(9H)-one
(2R,3S,5R)-5-(6-Amino-2-chloro-9H-purin-9-yl)-2-(hydroxymethyl)tetrahydrofuran-3-ol
(2R,3R,4S,5R)-2-(6-Amino-2-fluoro-9H-purin-9-yl)-5-(hydroxymethyl)tetrahydrofuran-3,4-diol
((2S,5R)-5-(6-Amino-9H-purin-9-yl)tetrahydrofuran-2-yl)methanol
N-(1-((2R,4S,5R)-4-Hydroxy-5-(hydroxymethyl)tetrahydrofuran-2-yl)-2-oxo-1,2-dihydropyrimidin-4-yl)benzamide
4-Amino-1-((2R,4S,5R)-4-hydroxy-5-(hydroxymethyl)tetrahydrofuran-2-yl)pyrimidin-2(1H)-one hydrochloride
2-Amino-9-((4aR,6R,7R,7aS)-2,7-dihydroxy-2-oxidotetrahydro-4H-furo[3,2-d][1,3,2]dioxaphosphinin-6-yl)-1,9-dihydro-6H-purin-6-one
Sodium (4aR,6R,7R,7aS)-6-(2-amino-6-oxo-1,6-dihydro-9H-purin-9-yl)-7-hydroxytetrahydro-4H-furo[3,2-d][1,3,2]dioxaphosphinin-2-olate 2-oxide
((2R,3S,4R,5R)-5-(2-Amino-6-oxo-3,6-dihydro-9H-purin-9-yl)-3,4-dihydroxytetrahydrofuran-2-yl)methyl tetrahydrogen triphosphate, disodium salt
(((2R,3S,4R,5R)-5-(2-Amino-6-oxo-1H-purin-9(6H)-yl)-3,4-dihydroxytetrahydrofuran-2-yl)methyl)triphosphoric acid, trisodium salt
(2R,3R,4S,5S)-4-Amino-2-(6-amino-9H-purin-9-yl)-5-(hydroxymethyl)tetrahydrofuran-3-ol
2-Amino-9-((2R,3R,4S,5R)-3,4-dihydroxy-5-(hydroxymethyl)tetrahydrofuran-2-yl)-1-methyl-1H-purin-6(9H)-one
(2R,3S,5R)-2-((Bis(4-methoxyphenyl)(phenyl)methoxy)methyl)-5-(5-methyl-2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl)tetrahydrofuran-3-yl (2-cyanoethyl) diisopropylphosphoramidite
(2R,3S,5R)-5-(6-Benzamido-9H-purin-9-yl)-2-((bis(4-methoxyphenyl)(phenyl)methoxy)methyl)tetrahydrofuran-3-yl (2-cyanoethyl) diisopropylphosphoramidite
N-((E)-3-(1-((2R,3R,4S,5R)-3,4-Dihydroxy-5-(hydroxymethyl)tetrahydrofuran-2-yl)-2,4-dioxo-1,2,3,4-tetrahydropyrimidin-5-yl)allyl)-2,2,2-trifluoroacetamide
6-Chloro-9-[2,3-O-(1-methylethylidene)-beta-D-ribofuranosyl]-9H-Purine
