Acetic acid, [[2-oxo-2-[(tetrahydro-2-oxo-3-thienyl)amino]ethyl]thio]- (9CI); 2-([[(2-Oxothiolan-3-yl)carbamoyl]methyl]sulfanyl)acetic acid; Dithiosteine,2-((2-Oxo-2-((2-oxotetrahydrothiophen-3-yl)amino)ethyl)thio)acetic acid,Erdosteine is a mucolytic. Erdosteine was developed for the treatment of chronic obstructive bronchitis.,Erdosteine API