乙酸酐   、                                                                                                                                                                                                                                                                                    以
                                                                                         
二氯甲烷                                                                                  为溶剂,
                                                                                                                                                    反应 8.0h,
                                                                                                                以250 mg的产率得到N-benzyloxycarbonyl-3-O-(2-acetamido-6-O-<2-acetamido-3,6-di-O-benzyl-2-deoxy-4-O-(2,3,4,6-tetra-O-benzyl-β-D-galactopyranosyl)-β-D-galactopyranosyl>-2-deoxy-3-O-(2,3,4,6-tetra-O-benzyl-β-D-galactopyranosyl)-α-D-galactopyr)-L-serine benzyl ester