[S-(R*,R*)]-3-[(o-aminophenyl)thio]-3-(p-methoxyphenyl)lactic acid

(αS,βS)-β-[(2-Aminophenyl)thio]-α-hydroxy-4-methoxybenzenepropanoic Acid is used in the synthesis of Diltiazem (D460620), a calcium channel blocher with vasodilating activity. Antianginal; antihypertensive; antiarrhythmic (class IV).