2-Mercaptothiazoline is an antithyroid agent that strongly reduces thyroid hormone levels. 2-Mercaptothiazoline is also used as an intermediate in the preparation of pesticides and other biologically active compounds. Synonyms: 2-Thiazolidinethione; 1,3-Thiazolidine-2-thione; 2-Mercapto-4,5-dihydrothiazole; 2-Thiazoline-2-thiol; 2-Thiothiazolidone; 4,5-Dihydro-2-mercaptothiazole; 4,5-Dihydrothiazole-2-thiol; Metabasal; NSC 680; Sancelent 2MT; Tetrahydrothiazole-2-thione; Thyroidan; WR 305