The partial purification and properties of an enzyme from the soluble fraction of rat liver that catalyses the reaction of glutathione with 2,3-unsaturated acyl thiol esters is described, and its possible role in the formation of S-carboxyalkylcysteines is discussed. The synthesis of S-(3-methylcrotonyl)- and S-(2-methylcrotonyl)-N-acetylcysteamine and of S-crotonyl-NN-dimethylcysteamine hydrochloride and dicyclohexylammonium S-crotonyl-N-acetyl-l-cysteine is described.

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