Medicine for Kala Azar : Urea Stibamine . He got nominated for first Nobel Prize in Medicine in 1929 Here

The Nobel Prize in Physiology or Medicine 1929 was divided equally between Christiaan Eijkman “for his discovery of the antineuritic vitamin” and Sir Frederick Gowland Hopkins “for his discovery of the growth-stimulating vitamins.”

The Nobel Prize in Physiology or Medicine 1939 was awarded to Gerhard Domagk “for the discovery of the antibacterial effects of prontosil.”