Metronidazole-OH

Metronidazole-OH is a hydroxylated derivative of metronidazole, featuring a hydroxymethyl group substituted at the hydrazine moiety. The structure retains the core 5-nitroimidazole scaffold but incorporates an additional hydroxyl functionality, altering its polarity and metabolic stability. This impurity arises via oxidative hydroxylation of the parent drug's methyl group, introducing a -CH2OH substituent adjacent to the nitrogen bridge. The compound exhibits enhanced hydrogen bonding capacity due to the hydroxyl group, impacting its chromatographic behavior. It serves as a critical HPLC reference standard for quantifying degradation pathways in metronidazole formulations.