Dpen-chain structure and configuration 自然界中存在的单糖大多为D型 CHO HO HO H-C-OH oh HO-C-H H H-C-OH HoHH H oh H-C-OH oh CH2OH CHOH CHOH D-(+)-葡萄糖( Glucose)二、Open-chain Structure and configuration 自然界中存在的单糖大多为D-型 CHO C-OH C-H C-OH C-OH CH2OH HOHHHCHO OH CH2OH HO H OH OH H H H CHO CH2OH D-(+)-葡萄糖(Glucose)