Four main conformations of (1→6)-β-linkage in the studied saccharides. Conformer I (φ, ψR, ψS, ω)=(40°, −140°, −25°, −60°); conformer II: (φ, ψR, ψS, ω)= (40°, −60°, 60°, −60°); conformer III: (φ, ψR, ψS, ω)= (40°, −140°, −25°, 60°); conformer IV: (φ, ψR, ψS, ω)= (40°, −60°, 60°, 60°).