pyrimidine nucleobase pyrimidone aminopyrimidine 2-amino-4-hydroxypyrimidine 111.043 111.102 2-Amino-4-oxypyrimidine 2-Amino-4-pyrimdinol 2-Amino-4-pyrimidone 2-aminopyrimidin-4-ol An aminopyrimidine in which the pyrimidine ring bears amino and hydroxy substituents at positions 2 and 4, respectively. Beilstein:606424 C4H5N3O C=1N=C(N=C(C1)O)N CAS:108-53-2 CHEBI:48118 CHEBI:55502 Gmelin:1827635 InChI=1S/C4H5N3O/c5-4-6-2-1-3(8)7-4/h1-2H,(H3,5,6,7,8) Isocytosine PMID:8911701 Reaxys:606424 XQCZBXHVTFVIFE-UHFFFAOYSA-N chebi_ontology