Cefpodoxime Proxetil impurity F (Crude) is a degradation byproduct arising from hydrolytic cleavage of the ฮฒ-lactam ring in the parent cephalosporin, retaining the thiazole core and proxetil ester moiety. Its structure features a deaminated side chain with a terminal sulfoxide group, distinguishing it from the parent compound. This impurity lacks the intact lactam functionality, rendering it inactive as an antibiotic. It serves as a critical HPLC reference standard for monitoring degradation pathways in cefpodoxime formulations.
