重氮甲烷   、                                                                                      
(2R,3S,8R,9S,10S)-10-(2,4-Dihydroxy-phenyl)-2-(3-hydroxy-4-methoxy-phenyl)-8-(3,4,5-trihydroxy-phenyl)-3,4,9,10-tetrahydro-2H,8H-pyrano[2,3-f]chromene-3,5,9-triol                                                                                                                                                                                              以
                                                                                         
甲醇   、                                                                                         
乙醚                                                                                  为溶剂,
                                                                                                                                                    反应 48.0h,
                                                                                                                生成                                                 (2R,3S,8R,9S,10S)-2-(3,4-Dimethoxy-phenyl)-10-(2,4-dimethoxy-phenyl)-5-methoxy-8-(3,4,5-trimethoxy-phenyl)-3,4,9,10-tetrahydro-2H,8H-pyrano[2,3-f]chromene-3,9-diol