Enrofloxacin EP Impurity F

Enrofloxacin EP Impurity F is a structurally related fluoroquinolone derivative characterized by a 4-oxo-1,4-dihydroquinoline-3-carboxylic acid scaffold with a fluorine substituent at position 6 and a 7-piperazin-1-yl group. It features a hydroxyl substitution at the C-8 position, distinguishing it from the parent drug. This impurity arises via oxidative degradation pathways, introducing a hydroxyl group into the quinolone core. It serves as a critical HPLC reference standard for quantifying process-related impurities in enrofloxacin active pharmaceutical ingredients.