N-<2-((2β,11bα)-1,3,4,6,7,11b-hexahydro-2H-benzo-quinolizin-2-ylamino)ethyl>methanesulfonamide dihydrobromide 以54.4%的产率得到4-Fluoro-N-(2R,11bS)-1,3,4,6,7,11b-hexahydro-2H-pyrido[2,1-a]isoquinolin-2-yl-N-(2-methanesulfonylamino-ethyl)-benzenesulfonamide; compound with (Z)-but-2-enedioic acid