CARBOHYDRATES 



15 



CHjOH 



I 



C=0 



I 

 HCOH 



I 

 HCOH 



I 



CHgOH 



D-ribulose 

 {D-ery thro -pentulose) 



CHoOH 



C=0 

 I 

 HCOH 



HOCH 



CHjOH 



L -xylulose 

 (h- threo-pentxilose) 



CHoOH 



I 2 



C=0 



I 

 HOCH 



I 

 HCOH 



I 

 HCOH 



I 



CH2OH 



CH2OH 



I I CHoOH 



keto -D-iructose 



/3-D-fructofuranose 



CH2OH 



sedoheptulose 

 (/3-D-aZ/ro-heptulofuranose) 



FIGURE 2-4: SOME KETOSES 



