Answer
Gerhard Domagk was a German physician and pathologist who is credited with the discovery of sulfonamidochrysoidine (KL730), a synthetic antibacterial dye that was the first effective treatment for streptococcal sepsis. Domagk's discovery was the foundation for the development of the sulfonamide antibiotics, which were widely used to treat bacterial infections until the advent of penicillin in the 1940s.