190 J. BADDILEY 



Guanosine-diphosphate-mannose has been isolated from yeast.^^^ This 

 nucleotide yields guanosine-5 '-phosphate on hydrolysis, contains two phos- 

 phate groups, and gives mannose on gentle hydrolysis. From its titration 

 and other properties it is believed to be a pyrophosphate analogous to 

 UDPG. 



An analogue of UDPG in which the glucose residue is substituted by 

 A^-acetylglucosamine has been isolated from yeast .^^^ 



"s E. Cabib and L. F. Leloir, J. Biol. Chem. 206, 779, (1954). 



"9 E. Cabib, L. F. Leloir, and C. E. Cardini, J. Biol. Chem. 203, 1055, (1953). 



