nucleotides

https://doi.org/10.1351/goldbook.N04255
Compounds formally obtained by esterification of the 3 or 5 hydroxy group of nucleosides with phosphoric acid. They are the monomers of nucleic acids and are formed from them by hydrolytic cleavage.
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Source:
PAC, 1995, 67, 1307. 'Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)' on page 1352 (https://doi.org/10.1351/pac199567081307)
See also:
PAC, 1992, 64, 143. 'Glossary for chemists of terms used in biotechnology (IUPAC Recommendations 1992)' on page 162 (https://doi.org/10.1351/pac199264010143)
White Book, 2nd ed., p. 109 (https://www.qmul.ac.uk/bibliog/white.html)