Product of chemical modification of a nucleobase.
Example: Products of oxidation (e.g. 8-oxoguanine), alkylation (e.g. O6-alkyl guanine), or deamination (e.g. uracil as a product of cytosine deamination).
See also: damage to DNA
Source:
PAC, 2018, 90, 1121. 'Terminology of bioanalytical methods (IUPAC Recommendations 2018)' on page 1149 (https://doi.org/10.1515/pac-2016-1120)