甲醇   、                                                                                      (5S*,7R*,8S*,10S*)-2,3-Epoxy-14-acetoxy-15-(2-methyl)propanoyloxyelema-1,3,11(13)-trien-8,12-olide                                                                                                                                                              在
                                                                                                                                                                                 
potassium carbonate                                                                                                                                  作用下,
                                                                                                                                                                                        反应 0.17h,
                                                                                                                以20 mg的产率得到(5S*,7R*,8S*,10S*)-Methyl 2,3-Epoxy-8-hydroxy-14-acetoxy-15-(2-methyl)propanoyloxyelema-1,3,11(13)-trien-12-oate