Formula：C₁₀H₂₁NO₇
    Molecular weight：267.28
    Specification：National standard, JP15

          Related substances（HPLC)：Total impurities<0.2%，

                                       Single impurity<0.1%

    Assay：>99.0% 
　

2． Intermediate：2,3,4,6-Tetra-O-benzyl-alpha-D-glucopyranose

   CAS No：6564-72-3

   Chemical structure：

    Formula：C₃₄H₃₆O₆

    Appearance：White acicular crystals

    Assay>98%(HPLC)

3. Intermediate：2,3,4,6-Tetra-O-benzyl-1-C-(dichloromethyl)-D-glucopyranose

   Chemical structure：

   Formula：C₃₅H₃₆Cl₂O₆

   Appearance：yellow powder

   Assay>98%(HPLC)

4． Intermediate：

    (1S)-(1(OH),2,4/1,3)-2,3,4-Tri-O-benzyl-1-C-[(benzyloxy)methyl]-6,6-dichloro-5-oxo-1,2,3,4-cyclohexanetetrol

    Chemical structure：

    Formula：C₃₅H₃₄Cl₂O₆

    Appearance：White crystalline powder

    Assay>98% (HPLC)

 5． Intermediate：

     (1S)-(1(OH),2,4/1,3)-2,3,4-Tri-O-benzyl-1-C-[(benzyloxy)methyl]-5-oxo-1,2,3,4-cyclohexanetetrol

      Chemical structure：

      Formula：C₃₅H₃₆O₆

      Appearance：White crystalline powder

      Assay>98% (HPLC)

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