H? 2、葡萄糖的构象 CH2OH HO CH2OH H? HO H? OH OH OH (1) H? H CH2OH OH OH H? OH HOO H H H? H? H H OH OH (2) BD-吡喃葡萄糖 H CH2OH HO CH2OH HO I OH (3) H OH H CH2OH H? OH OH HO OH H OH H? H? H? ca-D-吡喃葡萄糖 OH OH (4)2、葡萄糖的构象 O H H H CH2OH OH OH OH H H OH O H? H? H? H? H OH OH HO HO CH2OH O H? H? H? H? H? CH2OH OH OH OH HO (1) (2) -D-吡喃葡萄糖 O H H H CH2OH OH OH OH H H OH O H H H H H OH OH HO HO CH2OH O H H? H? H? CH2OH H? OH OH OH HO (4) (3) -D-吡喃葡萄糖