[(1R,4S,6R,7S,8R,9R,10S,12S,13S,16S,18S)-16-acetyloxy-6-(4-acetyloxy-3-hydroxy-3-methylbutyl)-7,9,13-trimethyl-5-oxapentacyclo[10.8.0.02,9.04,8.013,18]icos-2-en-10-yl] benzoate                                                                                                                                                              在
                                                                                                                                                                                 
碘苯二乙酸   、                                                                                                  
碘                                                                                                                                  作用下,
                                                                                                                                                                                        反应 12.0h,
                                                                                                                以78%的产率得到[(1R,4S,5'S,6S,7S,8R,9R,10S,12S,13S,16S,18S)-16-acetyloxy-5'-(acetyloxymethyl)-5',7,9,13-tetramethylspiro[5-oxapentacyclo[10.8.0.02,9.04,8.013,18]icos-2-ene-6,2'-oxolane]-10-yl] benzoate