dimethyl (2R,6aS,7S,11aR,11bR)-2-(((2R,3R,4R,5S,6R)-4,5-dihydroxy-6-(hydroxymethyl)-3-(3-methylbutanamido)tetrahydro-2H-pyran-2-yl)oxy)-7,9-dihydroxy-11b-methyl-8-methylenedodecahydro-6a,9-methanocyclohepta[a]naphthalene-4,4(1H)-dicarboxylate                                                                                                                                                              在
                                                                                                                                                                                 Dowex 50 W                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
甲醇                                                                                  为溶剂,
                                                                                                                                                    反应 8.0h,
                                                                                                                以13 mg的产率得到