N-<2-((2β,11bα)-1,3,4,6,7,11b-hexahydro-2H-benzo-quinolizin-2-ylamino)ethyl>methanesulfonamide dihydrobromide 以19.7%的产率得到Propane-1-sulfonic acid (2R,11bS)-1,3,4,6,7,11b-hexahydro-2H-pyrido[2,1-a]isoquinolin-2-yl-(2-methanesulfonylamino-ethyl)-amide; compound with (Z)-but-2-enedioic acid