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From The Collaborative International Dictionary of English v.0.48:
nystatin \nystatin\ n. [From NY state + -in, due to its discovery in New York State.] An antifungal antibiotic, extracted from fermentation broths of the soil actinomycete Streptomyces noursei and other actinomycetes; called also fungicidin. It is a polyene macrolide antibiotic, and consists of several related components. Component nystatin A1 has formula C47H75NO17. [WordNet 1.5]