Synonyms: 2,4,6(1H,3H,5H)-Pyrimidinetrione,5-[(hexahydro-2,4,6-trioxo-5-pyrimidinyl)imino]-, monoammonium salt,monohydrate (9CI); Barbituric acid, 5,5'-nitrilodi-, ammonium deriv.,monohydrate (8CI); Acid ammonium purpurate monohydrate; Ammonium purpuratemonohydrate; Murexide monohydrate