Erythromycin Imp F

Erythromycin Imp F is a process-derived impurity stemming from incomplete glycosylation during erythromycin synthesis. It retains the core 14-membered macrolactone scaffold but lacks the 3'-methylamino sugar moiety, featuring instead a truncated glycosidic linkage at C-5. The molecule contains multiple hydroxyl groups, an amino function, and an esterified cladinose sugar at C-6, with a terminal hydroxyl at C-12. This structural deficit reduces its antibiotic activity compared to the parent compound. It serves as an HPLC reference standard for quantifying this specific synthetic byproduct in erythromycin APIs.