甲醇   、                                                                                      {(2R,3S,4R,6R)-4-Benzyloxy-6-[2-((2R,3S,4R,6R)-4-benzyloxy-6-hydroxymethyl-3-methyl-tetrahydro-pyran-2-yl)-acetoxymethyl]-3-methyl-tetrahydro-pyran-2-yl}-acetic acid methyl ester                                                                                                                                                              在
                                                                                                                                                                                 
potassium tert-butylate                                                                                                                                  作用下,
                                                                                                                                                                                        反应 11.0h,
                                                                                                                生成                                                 
((2R,3S,4R,6R)-4-Benzyloxy-6-hydroxymethyl-3-methyl-tetrahydro-pyran-2-yl)-acetic acid methyl ester