Ethanamine, 2,2′-dithiobis-, (2R,3R)-2,3-dihydroxybutanedioate (1:1); 2,2'-disulfanediylbis(ethan-1-amine) (2R,3R)-2,3-dihydroxysuccinate; 2,2'-disulfanediyldiethanamine (2R,3R)-2,3-dihydroxysuccinate