539 Purines 



Coprinus comatis Gray, Boletus edulis, Polyporus sul- 

 fureus 



Paul Heinz List, Arch. Pharrn. 291 502 (1958). 



E. Winterstein and C. Reuter, Centr. Bakt. Parasitenk. II 

 Abt. 34 566 ( 1912). {Chem. Abstr. 6 3279) 



Paul Heinz List, Planta Med. 6 424 (1958). 



1027 Guanine, C3H5ON5, (Picrate) dec. from 190°. 



HN 



Coprimis comatis Gray, Boletus edulis 

 Paul Heinz List, Arch. Pharin. 291 502 (1958). 

 E. Winterstein, C. Reuter and R. Korolev, /. Chem. Soc. 104 

 I 433 (1913). 



1028 Heteroxanthine, CgHeOoN^, colorless crystals, m.p. ~380° 



(dec). 



O ^^^ 



O H 



Yeast 



P. W. Wiardi and B. C. P. Jansen, Rec. trav. chim. 53 205 

 (1934). 



1029 Toxoflavin, C6H6O2N4, yellow crystals, m.p. 171°. 



CH3 



N 



An 



O H 



Pseudomonas cocovenenans 



A. G. van Veen and W. K. Mertens, Proc. Acad. Sci. Amster- 

 dam 36 666 (1933). (Isolation) (Chem. Abstr. 27 5771) 



A. G. van Veen and J. K. Baars, Rec. trav. chim. 57 248 

 (1938). (Structure) 



