n- ( 2,3-dimercaptopropyl ) phthalamidic acid ( dmpa ) , meso-dimercaptosuccinic acid ( dmsa ) , and 2,3-dimercapto-1-propanesulfonic acid ( dmps ) are dithiol chelating agents with antidotal activity for lead , mercury , arsenic , and other heavy metals .
C0025424
mercury
C0347988
heavy