Term Name:	4-oxoproline zwitterion
Synonyms:	4-oxopyrrolidinium-2-carboxylate
Definition:	An amino acid zwitterion obtained from 4-oxoproline by transfer of a proton from the α-carboxy group to the amino group; major species at pH 7.3.
Ontology:	ChEBI [CHEBI:77656]  ( EBI )