4-磷酸赤藓糖 5-酸木酮糖 CH,OHI HC=O C=0 H C-OH + HO CH H C-OH CH2O- P CH20- 转酮醇酶 CH2OH HC=O HO-C-H HC=0 + H C-OH H C-OH H C-OH CH2OP F-6-P CH2O 3-磷酸甘油醛H C ＝ O C—OH C—OH CH2O— P H H 4-磷酸赤藓糖 C＝O P CH2OH HO CH C—OH CH2O— H 5-磷酸木酮糖 P C—OH C—OH CH2O— H H CH2OH H C ＝ O H O -C —H P C ＝ O C—OH CH2O— H H + + F-6-P 3-磷酸甘油醛 转酮醇酶