High Quality Content by WIKIPEDIA articles! Antimony potassium tartrate, also known as potassium antimonyl tartrate or emetic tartar has the formula K2Sb2(C4H2O6)2 is the double salt of potassium and antimony of tartaric acid. The compound has long been known as a powerful emetic. Besides, the compound was used in the treatment of schistosomiasis and leishmaniasis.