乙酸酐   、                                                                                      
2-[(3R,4R,5S,6R)-3-Acetylamino-5-((2S,3R,4R,5S,6R)-3-acetylamino-4,5-dihydroxy-6-hydroxymethyl-tetrahydro-pyran-2-yloxy)-2-hydroxy-6-hydroxymethyl-tetrahydro-pyran-4-yloxy]-propionic acid                                                                                                                                                              在
                                                                                                                                                                                 
吡啶                                                                                                                                  作用下,
                                                                                                                                                                                                                            生成                                                 2-[(2R,3R,4R,5S,6R)-2-Acetoxy-6-acetoxymethyl-3-acetylamino-5-((2S,3R,4R,5S,6R)-4,5-diacetoxy-6-acetoxymethyl-3-acetylamino-tetrahydro-pyran-2-yloxy)-tetrahydro-pyran-4-yloxy]-propionic acid