CHO C00 CH2OH HCOH HCOH NADP+ NADPH+H NADP+ NADPH+H+ HOCH HOCH HCOH HCOH HCOH C02 HCOH HCOH HCOH CH20民○ CH20R○ CH20○ 核酮糖-了-璘酸 葡糖-6-磷酸 葡糖酸-6-璘酸 →果糖-6-璘酸(C6) 景天糖-7-璘骏(C)核糖-5-璘酸(C5)· 赤藓糖-4-璘酸(C)甘油醛-3-璘酸(C)木酮糖-5-璘睃(C5)· 甘油醛-3-璘酸(C) 果糖-1,6-二璘酸(C6) 二羟丙酮磷睃(C) H20 Pi 1818