has role macrolide antibiotic nystatins A polyene antifungal antibiotic complex containing three biologically active components, A1, A2 and A3. Produced by Streptococcus noursei, S. aureus and other Streptococcus species. CHEBI:59676 Patent:US2832719 Patent:US3517100 chebi_ontology bacterial metabolite antibiotic antifungal drug