prontosil

noun
pron·​to·​sil | \ ˈprän-tə-ˌsil How to pronounce prontosil (audio) \

Medical Definition of prontosil

: any of three sulfonamide drugs:
a : a red azo dye C12H13N5O2S that was the first sulfa drug tested clinically

called also prontosil rubrum

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