在
                                                                                                                                                                                 
三氟乙酸                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
甲苯                                                                                  为溶剂,
                                                                                                                                                    反应 6.0h,
                                                                                                                生成                                                 (1S,16R,23R,27S)-25-oxaheptacyclo[14.6.5.02,15.04,13.06,11.017,22.023,27]heptacosa-2,4,6,8,10,12,14,17,19,21-decaene-24,26-dione   、                                                                                             
(1R,16S,23R,27S)-25-oxaheptacyclo[14.6.5.02,15.04,13.06,11.017,22.023,27]heptacosa-2,4,6,8,10,12,14,17,19,21-decaene-24,26-dione