Antimony potassium tartrate also known as potassium antimonyl tartrate potassium antimontarterate or emetic tartar has the formula K2Sb2(C4H2O6)2 and is the double salt of potassium and antimony of tartaric acid.

GRF, porcine

3-methylthiopropionate is one of the metabolites of methionine (especially of D-methionine). Cultures of Streptomyces lincolnensis accumulated 3-methylthioacrylic acid in amounts directly related to the concentration of methionine in the medium. The first intermediate in the pathway may be the keto acid which is then oxidatively decarboxylated to 3-methylthiopropionic acid.