325 Amino Acids and Related Compounds 



Bruce N. Ames, Herschel K. Mitchell and Mary B. Mitchell, 

 /. Am. Chem. Soc. 75 1015 (1953). 



688 L-Histidine, CoHoOsNa, colorless crystals, m.p. 287° (dec), 



[aln''' -39.7° "(c 1.13 in water). 



CH— C— CH2— CH—COOH 



I I I 



N NH NH, 



CH 



Claviceps purpurea (Fries) Tul. 



H. Heath and Jennifer Wildy, Biochem. J. 64 612 (1956). 



689 6-Diazo-5-oxo-L-norleucine (DON), C6H9O3N3, pale greenish 



yellow crystals, m.p. 145-155° (dec), [aW +21° (c 5.4 

 in water). 



O 



N2CH—C—CH2—CH2— CH—COOH 



NH2 



An unclassified streptomycete 



Henry W. Dion, Salvatore A. Fusari, Zbigniew L. Jakubow- 

 ski, John G. Zora and Quentin R. Bartz, /. Am. Chem.. Soc. 78 

 3075 (1956). (Isolation and characterization) 



690 Imidazoleglycerol (Hydrochloride), CeHioOgNg-HCl, colorless 



crystals, m.p. 103° (dec), hW^ +13.3° (c 7.5 in water). 



Neurospora crassa mutant 



Bruce N. Ames and Herschel K. Mitchell, /. Biol. Chem. 212 

 687 (1955). 



691 L-Histidinol (Hydrochloride), CoH„ON3-2HCl, colorless crys- 

 tals, m.p. 194° (dec). 



E. coli mutant 



Henry J. Vogel, Bernard D. Davis and Elizabeth S. Mingioli, 

 /. Am. Chem. Soc. 73 1897 (1951). 



