5-Nitro-1H-iMidazole-1-ethanol;Metronidazole impurity D (EP);2-(5-nitro-1H-imidazol-1-yl)ethan-1-ol;Metronidazole Impurity 4(Metronidazole EP Impurity D);1-(2-Hydroxyethyl)-5-nitroiMidazole;Metronidazole EP Impurity D;Imp. D (EP):2-(5-Nitro-1H-imidazol-1-yl)-ethanol;2-(5-Nitro-1H-imidazol-1-yl)ethanol