has functional parent is tautomer of allantoin hydantoin ureas imidazolidinone 1-(5-hydroxy-2-oxo-2,3-dihydroimidazol-4-yl)urea 0 1-(5-hydroxy-2-oxo-2,3-dihydro-1H-imidazol-4-yl)urea 158.044 158.11540 2-oxo-4-hydroxy-5-ureidoimidazoline An imidazolidinone that is imidazolin-2-one substituted at positions 4 and 5 by hydroxy and ureido groups respectively. C4H6N4O3 CHEBI:74345 InChI=1S/C4H6N4O3/c5-3(10)6-1-2(9)8-4(11)7-1/h9H,(H3,5,6,10)(H2,7,8,11) MLVVTNIFHMERMU-UHFFFAOYSA-N NC(=O)Nc1[nH]c(=O)[nH]c1O PMID:20826786 allantoin, enol-form chebi_ontology