Answer: sulfanilamides

AnswerCrossword Clue
sulfanilamideswhite, crystalline amide of sulfanilic acid, C6H8N2O2S, formerly used in the treatment of bacterial infections: replaced by its derivatives and by antibiotics
sulfanilamidesSULFANILAMIDE, a crystalline sulfonamide that is the parent compound of most of the sulfa drugs