By 1935, Mietzsch and Klarer had prepared two forms of the compound, one is poorly soluble in water while the other is highly soluble. The water-soluble compound was given a name Streptozon (specifically Streptozon S, for the soluble sodium salt) after the bacterium with which it was originally experimented, and the less water-soluble was called Prontosil (specifically Prontosil rubrum). Prontosil was used as the common name for both and the brand name of the drug after 1935. Domagk had used only the Streptozon type. He reported the development of the drug and his human application in article "Chemotherapie der streptokokken-infektionen" ("Chemotherapy of streptococcus infection") in the October issue of Klinische Wochenschrift (later Journal of Molecular Medicine).
