(S)-7-butyryloxy-5-chloro-3-(3-hydroxypropyl)-7-methyl-6H-isochromene-6,8-dione   、                                                                                      
cyclo(-L-Orn-L-Thr-L-Ala-L-Asn-D-Asn-D-Leu-L-Thr-D-Leu-D-Ada-)                                                                                                                                                              在
                                                                                                                                                                                 
N-溴代丁二酰亚胺(NBS)   、                                                                                                  
碳酸氢钠   、                                                                                                  
silver(l) oxide                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
乙腈                                                                                  为溶剂,
                                                                                                                                                    反应 73.0h,
                                                                                                                以5 mg的产率得到[(3S,4R,7S)-2-[3-[(2S,5S,8S,11S,14R,17R,20S,23R,26R)-11,14-bis(2-amino-2-oxoethyl)-5,20-bis[(1R)-1-hydroxyethyl]-8-methyl-17,23-bis(2-methylpropyl)-26-octyl-3,6,9,12,15,18,21,24,27-nonaoxo-1,4,7,10,13,16,19,22,25-nonazacycloheptacos-2-yl]propyl]-5-chloro-4-hydroxy-7-methyl-6,8-dioxospiro[4H-isoquinoline-3,2'-oxolane]-7-yl] butanoate