521 



Pyrimidines 



Yeast 



This compound is a biogenetic precursor of the lecithins 

 and cephahns. 



Irving Lieberman, L. Berger and W. Theodore Gimenez, 

 Science 121 81 (1956). 



Eugene P. Kennedy and Samuel B. Weiss, J. Biol. Cheni. 

 222 193 (1956). 



1017 Cytidine Diphosphate Ribitol, Cj^Ho-PigNaPs. 



O O N 



T T /^N 



CH2— CH— CH— CH— CH2— O— P— O— P— O— CHo O 



OH OH OH OH 



OH 



O 

 H 



OH OH 



Lactobacillus arabinosus 



J. Baddiley and A. P. Mathias, /. Chem. Soc, 2723 (1954). 

 J. Baddiley, J. G. Buchanan, B. Cares, A. P. Mathias and 

 A. R. Sanderson, Biochem. J. 64 599 (1956). 



1018 Uridinediphosphateglucose (UDPG), C15H04O17N2P2. 



OH 

 O 



CH2OH 



A — o. 



K \l o o 



koH yi II II 



HO N K O— P— O— P- 



-0— CHo 



OH 



OH OH 



OH OH 



Yeast, molds 



A uridinediphosphateacetylglucosamine also has been 

 isolated from yeast. 



R. Caputto, Luis F. Leloir, C. E. Cardini and A. C. Paladini, 

 J. Biol. Chem. 184 333 (1950). 



E. Cabib, Luis F. Leloir and C. E. Cardini, ibid. 203 1055 

 (1953). 



J. G. MofFatt and H. G. Khorana, /. Am. Chem. Soc. 80 3756 

 (1958). (Synthesis) 



