(8aS)-3-benzo[1,3]dioxol-5-ylmethyl-3-hydroxy-2-[2-(1H-indol-3-yl)-ethyl]-3-methyl-hexahydro-pyrrolo[1,2-a]pyrazine-1,4-dione                                                                                                                                                              在
                                                                                                                                                                                 
盐酸                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
乙酸乙酯                                                                                  为溶剂,
                                                                                                                                                                                        以49%的产率得到(3S,12bS)-12b-benzo[1,3]dioxol-2,3,6,7,12,12b-hexahydropyrrolo-pyrazino[1',2':1,2]pyrido[3,4-b]indole-1,4-dione