3-[[4-[(2-carboxyethylamino)-oxomethyl]phenyl]hydrazinylidene]-6-oxo-1-cyclohexa-1,4-dienecarboxylic acid
3-[[4-[(2-carboxyethylamino)-oxomethyl]phenyl]hydrazinylidene]-6-oxo-1-cyclohexa-1,4-dienecarboxylic acid