Ethanesulfonic acid {2-[(2R,11bS)-(1,3,4,6,7,11b-hexahydro-2H-pyrido[2,1-a]isoquinolin-2-yl)amino]-ethyl}-amide; hydrochloride 以40.5%的产率得到Ethanesulfonic acid [2-((2R,11bS)-1,3,4,6,7,11b-hexahydro-2H-pyrido[2,1-a]isoquinolin-2-yl-methanesulfonyl-amino)-ethyl]-amide; compound with (Z)-but-2-enedioic acid