. . . "3-(5-Oxo-1,4-dihydroimidazol-4-yl)propanoic acid" . . . "Imidazol-4-one-5-propionic acid" . . . . . . . "Imidazol-4-one-5-propionic acid" . . . . . . "4,5-dihydro-4-oxo-5-imidazolepropanoate" . "imidazol-4-one-5-propionic acid" . . .