81129-73-9 Dfa III Difructose anhydride III alpha-D-Fructofuranose beta-D-fructofuranose 1,2':2,3'-dianhydride beta-2,1'-alpha-2',3-Difructofuranose anhydride pdb file: 773414.pdbsdf file: 773414.sdfdirectory: 773414