(2R,11bS)-N1-(1,3,4,6,7,11b-Hexahydro-2H-pyrido[2,1-a]isoquinolin-2-yl)-butane-1,4-diamine 以45.6%的产率得到N-(2R,11bS)-1,3,4,6,7,11b-Hexahydro-2H-pyrido[2,1-a]isoquinolin-2-yl-N-(4-methanesulfonylamino-butyl)-methanesulfonamide; compound with (Z)-but-2-enedioic acid