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]
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