CH=O CHFN-NH-GH5 H-OH C-N-NH-GH5 HO-H 3 CoH NH-NH HO-H H-OH H-OH +NH +H2O H-OH CHOH CHOH D(+)葡萄糖 D-葡萄糖脎 CH2OH CHFN-NH-CH5 C-O C=N-NH-CH5 HO -H 3 C6HsNH-NH HO -H H-OH H-OH C6H5NH2+NHB +H2O H-OH H十OH CHOH CHOH D()果糖 D果糖脎（葡萄糖脎）