构象:船式和椅式,后者为稳定构象 H HO CH,OH HO CH,OH H H HO H OH OH OH H H OH H a-D-吡喃葡萄糖 β-D-吡喃葡萄糖构象：船式和椅式，后者为稳定构象 O H HO H HO H OH OH H H CH2 OH α-D-吡喃葡萄糖 β-D-吡喃葡萄糖 O H HO H HO H H OH H OH CH2 OH