dexamethasone 21-(p-nitrophenyl carbonate)   、                                                                                      (2S)-N-[(2S)-1-(6-aminohexylamino)-1-oxo-6-[3-[(2R,3S,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]sulfanylpropanoylamino]hexan-2-yl]-2,6-bis[3-[(2R,3S,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]sulfanylpropanoylamino]hexanamide                                                                                                                                                                                              以
                                                                                         
N,N-二甲基甲酰胺                                                                                  为溶剂,
                                                                                                                                                    反应 0.5h,
                                                                                                                以73%的产率得到N
α-
α,Nε-bis<3-(α-D-mannopyranosylthio)propionyl>-L-lysyl>-N-<6-(carboxyamino)hexyl>-Nε-<3-(α-D-mannopyranosylthio)propionyl>-L-lysinamide, dexamethasone 21-ester