glucomannogalactan(with a molar ratio of galactose, mannose and glucose of 3.9:1.9:1.0) with a backbone of (1→2)-linked α-mannopyranose with the every second residue substituted at position 6 by a pentasaccharide branch, composed of four (1→6)-linked β-galactofuranose residues with terminal α-glucopyranose residue attached to the last galactofuranose residue at position 2   、                                                                                      
乙酸酐   、                                                                                      
碘甲烷                                                                                                                                                                                                                                                                                                          生成                                                 
1,4,6-tri-O-acetyl-2,3,5-tri-O-methyl-galactitol   、                                                                                             
1,2,5-tri-O-acetyl-3,4,6-tri-O-methyl-D-mannitol   、                                                                                             
1,5-O-di-acetyl-2,3,4,6-tetra-O-methyl-D-glucitol   、                                                                                             
1,2,5,6-tetra-O-acetyl-3,4-di-O-methyl-D-mannitol   、                                                                                             
1,2,4-tri-O-acetyl-3,5,6-tri-O-methyl-galactitol