(4β,6;4α,8)-bis-(-)-robinetinidol-(+)-catechin di-O-methyl ether                                                                                                                                                              在
                                                                                                                                                                                 
碳酸氢钠   、                                                                                                  
sodium carbonate                                                                                                                                  作用下,
                                                                                                                                                                                        反应 2.5h,
                                                                                                                生成                                                 (2R,3S,4S,8R,9S)-4-(2,4-Dihydroxy-phenyl)-6-[(2R,3S,4S)-3,7-dihydroxy-2-(3,4,5-trihydroxy-phenyl)-chroman-4-yl]-8-(3,4-dimethoxy-phenyl)-2-(3,4,5-trihydroxy-phenyl)-3,4,9,10-tetrahydro-2H,8H-pyrano[2,3-f]chromene-3,5,9-triol