sulfapyridine

noun

sul·​fa·​pyr·​i·​dine

variants or chiefly British sulphapyridine

ˌsəl-fə-ˈpir-ə-ˌdēn 

: a sulfa drug C₁₁H₁₁N₃O₂S that is derived from pyridine and sulfanilamide and is used in small doses in the treatment of dermatitis herpetiformis and especially formerly against pneumococcal and gonococcal infections