Natamycin is a polyene antifungal that works by interacting with fungal cell membranes, altering their permeability and causing the cells to break up. It has a particular effect on fungal cell membranes, making it a useful antifungal agent. Natamycin is classified based on both its chemical structure as a polyene antifungal and its mechanism of action, which involves interacting with and disrupting fungal cell membranes.