2-[4-(4-oxo-1-phenyl-1,3,8-triazaspiro[4.5]decan-8-yl)butyl]-1H-benz[de]isoquinoline-1,3(2H)-dione, hydrochloride   、                                                                                      
1,5-二溴戊烷   、                                                                                      
1,4-二溴丁烷                                                                                                                                                                                                                                                                                                          以obtains 2-(5-bromopentyl)-1H-benz[de]isoquinoline-1,3(2H)-dione的产率得到2-(5-bromopentyl)-1H-benzo[de]isoquinoline-1,3(2H)-dione