The Chemical Entities of Biological Interest (ChEBI) ontology is downloaded weekly from EMBL-EBI at http://www.ebi.ac.uk/chebi/. The data is made available under the Creative Commons License (CC BY 3.0, http://creativecommons.org/licenses/by/3.0/). For more information see: Degtyarenko et al. (2008) ChEBI: a database and ontology for chemical entities of biological interest. Nucleic Acids Res. 36, D344–D350.
A member of the class of pyrimidones that is 4-amino-5-hydroxy-2,5-dihydropyrimidin-2-one in which the hydrogen at position 6 by a 5-methyl-2-oxo-1,2,3,4-tetrahydropyrimidin-4-yl group.