3-[N,N-bis(ethoxycarbonylmethyl)aminomethyl]-5-nitrosalicylaldehyde   、                                                                                      
6-[N',N'-bis(ethyloxycarbonylmethyl)aminomethyl]-1,3,3-trimethyl-exo-methyleneindoline                                                                                                                                                                                              以
                                                                                         
乙醇                                                                                  为溶剂,
                                                                                                                                                                                        生成                                                 Ethyl 2-[[8-[[bis(2-ethoxy-2-oxoethyl)amino]methyl]-1',3',3'-trimethyl-6-nitrospiro[chromene-2,2'-indole]-6'-yl]methyl-(2-ethoxy-2-oxoethyl)amino]acetate