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 1,2-dihydropyrimidin-2-one in which the hydrogen at position 4 is replaced by a 5,6-diamino-2-oxo-2,3,4,5-tetrahydropyrimidin-4-yl group.