[(1S,3S,4S,5S,7S,8S,10S,11S,13S)-4-(acetyloxymethyl)-4,5,7,10,13-pentahydroxy-8,15,15-trimethyl-12-methylidene-2,9-dioxo-1-tricyclo[9.3.1.03,8]pentadecanyl] benzoate   、                                                                                      
乙酸酐                                                                                                                                                              在
                                                                                                                                                                                 
吡啶   、                                                                                                  
4-二甲氨基吡啶                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
二氯甲烷                                                                                  为溶剂,
                                                                                                                                                    反应 2.0h,
                                                                                                                以49%的产率得到[(1S,3S,4S,5S,7S,8S,10S,11S,13S)-5,7,10,13-tetraacetyloxy-4-(acetyloxymethyl)-4-hydroxy-8,15,15-trimethyl-12-methylidene-2,9-dioxo-1-tricyclo[9.3.1.03,8]pentadecanyl] benzoate