565 Pteridines and Flavines 



Mycobacterium tuberculosis 



Also occurs as a butterfly wing pigment. 



Marguerite 0"L. Crowe and Amy Walker, Brit. J. Exptl. 

 Pathol. 35 18 (1954). (Isolation from this organism) 



Robert Purrmann, Ann. 546 98 (1940), 548 284 (1941). 

 (Synthesis) 



1049 Pterin-like Substance. 



By paper chromatographic comparisons this purple 

 fluorescent substance was shown to be similar to or identi- 

 cal with 2-amino-4,7-dihydroxypteridine-6-acetic acid 

 (C,H,0,N,). 



As-pergilli 



Yasuyuki Kaneko, /. Agr. Chem. Soc. Japan 31 122 (1957). 



1050 Erythropterin, C.,H;,0-,N-„ deep red crystals from 0.01 N hydro- 



chloric acid. 



OH 



I /OH 



H2N C=C— CH2OH 



I I 

 OH OH 



Mycobacterium tuberculosis var. hominis, M. lacticola 

 M. O'L. Crowe and A. Walker, Science 110 166 (1949). 

 Rudolf Tschesche and Frederic Vester, Chem. Ber. 86 454 

 (1953). 



1051 Biopterin, C9H11O3N5, pale yellow crystals, m.p. 250-280° 



(dec), [aln^" -50° (in 0.1 N hydrochloric acid). 



OH 



I XH— CH— CH3 



N 



/ 

 H2N 



-^Kl/-\l 



OH OH 



Yeast, Ochromonas malhamensis 



E. L. Patterson, H. P. Broquist, Alberta M. Albrecht, M. H. 

 von Saltza and E. L. R. Stokstad, /. Am. Chem. Soc. 77 3167 

 (1955). 



