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2-iminoimidazolidin-4-one 2-Amino-1-imidazoline-4-one 2-Amino-2-imidazoline-4-one 2-amino-1,4-dihydroimidazol-5-one 2-azanyl-1,4-dihydroimidazol-5-one 2-amino-1,5-dihydro-4H-imidazol-4-one 4H-IMidazol-4-one,2-aMino-3,5-dihydro-