has role cytosine Cyt cytosine CHEBI:41732 CHEBI:16040 Cytosine CHEBI:14066 4-amino-2(1H)-pyrimidinone Zytosin An aminopyrimidine that is pyrimidin-2-one having the amino group located at position 4. C Cytosin CHEBI:4072 CHEBI:23531 4-amino-2-hydroxypyrimidine chebi_ontology pyrimidine nucleobase pyrimidone aminopyrimidine mouse metabolite Saccharomyces cerevisiae metabolite Escherichia coli metabolite human metabolite