a. Structures and nomenclature for isomeric disaccharides and monosaccharide-glycolaldehydes. b. The dissociation scheme from D-Glc-α-(1-2)-D-Glc to α-D-Glc-GA. c. The potential gas-phase configurations of α-D-Glc-GA.-Note: the species shown in Tables 1b and 1c can be either [M+Na]+ ions or [M-H]- ions.