13419-67-5 2-Mercaptopropionic acid, ammonium salt 79-42-5 Ammonium 2-mercaptopropionate Ammonium thiolactate EINECS 236-526-4 Lactic acid, thio-, monoammonium salt Propionic acid, 2-mercapto-, monoammonium salt Thiolactic acid, ammonium salt