2-Aminothiazoline-4-carboxylic acid (ACTA) is the organosulfur compound and a heterocycle with the formula HO<sub>2</sub>CCHCH<sub>2</sub>SCNH<sub>2</sub>N. This derivative of thiazoline is an intermediate in the industrial synthesis of <small>L</small>-cysteine, an amino acid. ACTA exists in equilibrium with its tautomer 2-iminothiazolidine-4-carboxylic acid.
It is produced by the reaction of methyl chloroacrylate with thiourea. It is also a biomarker for cyanide poisoning, as it results from the condensation of cysteine and cyanide.