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The structure for a product of the oxidation of creatinine is revised to be N-(N′-methylamidino)oxamic acid (4). Acyclic product 4 and its cyclic product, 2-amino-1-methyl-4,5-imidazoledione, are coined as creatones B and A, respectively. The first synthesis of 2-methylamino-4,5-imidazoledione is also described.