CAS: 71-30-7 Molecular Formula: C4H5N3O Molecular Weight (g/mol): 111.10 MDL Number: MFCD00006034 InChI Key: OPTASPLRGRRNAP-UHFFFAOYSA-N Synonym: cytosine,4-amino-2-hydroxypyrimidine,cytosinimine,2 1h-pyrimidinone, 4-amino,4-amino-2 1h-pyrimidinone,4-aminopyrimidin-2 1h-one,6-aminopyrimidin-2 1h-one,2 1h-pyrimidinone, 6-amino,cyt,4-amino-2-oxo-1,2-dihydropyrimidine PubChem CID: 597 ChEBI: CHEBI:16040 IUPAC Name: 6-amino-1,2-dihydropyrimidin-2-one SMILES: NC1=CC=NC(=O)N1