19230-81-0 2-Amino-1,5-dihydro-1-methyl-4H-imidazol-4-one, monohydrochloride 2-Imino-1-methylimidazolidin-4-one hydrochloride 4H-Imidazol-4-one, 2-amino-1,5-dihydro-1-methyl-, monohydrochloride EINECS 242-898-9