Erythromycin Oxime is the major metabolite of Roxithromycin which is also an intermediate of Azithromycin. It exhibits antibacterial properties and is also Roxithromycin impurity C.

Nystatin A1 is the one of the first member of important class of a macrocyclic polyene and poly-ol antibiotics isolated from Streptomyces noursei in 1950. Nystatin A1 binds to ergosterol, a major component of the fungal cell membrane. When present in sufficient concentrations, it forms pores in the membrane that lead to K+ leakage, acidification, and death of the fungus. Nystatin A1 is major component of Nystatin an important antifungal antibiotic, which for over half a century has been broadly used in medicine for the treatment of topical fungal infections caused by a broad spectrum of fungal pathogens comprising yeast-like and filamentous species.