方酸二乙酯   、                                                                                      
3-(3-{2-[2-(2-aminoethoxy)ethoxy]ethylamino}oxopropylthio)propyl 2-O-(2-acetamido-3,4,6-tri-O-benzyl-2-deoxy-β-D-glucopyranosyl)-3-O-carbamoyl-α-D-galactopyranosiduronamide                                                                                                                                                                                              以
                                                                                         
乙醇   、                                                                                         
水                                                                                  为溶剂,
                                                                                                                                                    反应 18.0h,
                                                                                                                以66%的产率得到3-[3-(2-{2-[2-(2-ethoxy-3,4-dioxocyclobut-1-en-1-ylamino)ethoxy]ethoxy}ethylamino)oxopropylthio]propyl 2-O-(2-acetamido-3,4,6-tri-O-benzyl-2-deoxy-β-D-glucopyranosyl)-3-O-carbamoyl-α-D-galactopyranosiduronamide