(2R,3S,4S,2'R,3'S)-2,2'-Bis-(3,4-dihydroxy-phenyl)-3,4,3',4'-tetrahydro-2H,2'H-[4,6']bichromenyl-3,7,3',7',8'-pentaol                                                                                                                                                              在
                                                                                                                                                                                 
吡啶                                                                                                                                  作用下,
                                                                                                                                                                                                                            生成                                                 (2R,3S)-2,3-trans-3-acetoxy-6-<(2R,3S,4R)-2,3-trans-3,4-cis-3-acetoxy-3',4',7-trimethoxyflavan-4-yl>-3',4',7,8-tetramethoxyflavan