The dis c overy in these laboratories of the chemotherapeutic activity of diaminodiphenysulphone (Buttle et al. I937) stimulateJ a search ' for derivatives having the efficiency of the parent drug " The de:velopment of sulphetrone is part of a programme of work on Antituberculous Com p ounds carried out by the Therapeutic Resenrch Corporation of (;reat Britain.