Theophyllidine Hydrochloride;N-methyl-4-(methylamino)-1H-imidazole-5-carboxamide,hydrochloride;Theophyllidine Hydro;N-Methyl-5(or 4)-MethylaMino-;Theophylline EP Impurity D HCl;N-methyl-4-(methylamino)-1H-imidazole-5-carboxamide:hydrochloride;N-Methyl-5-(MethylaMino)-1H-iMidazole-4-carboxaMide Hydrochloride