335 



Polypeptides and Related Compounds 



TABLE 1 -Continued 



* By courtesy of Dr. H. Boyd Woodruff, Merck, Shorpe and Dohme, and the New York 

 Academy of Science. 



t See the discussion of nomenclature preceding the actinomycin entries. 



Often these polypeptide pigments occur in closely related com- 

 plexes, the individual members varying only by slight changes 

 in the side-chains. 



The chromophore, actinocinin, resembles that of the ommo- 

 chromes, a group of insect pigments studied by Butenandt,' and 

 it is similar to the pigment cinnabarin from a higher fungus. 



COOH 

 NH, 



COOH 



CH3 CH3 



Actinocinin 



^o--^=^\ 

 o 



Xanthommatin 



^ Adolph Butenandt, Ulrich Schiedt, Ernst Biekert and Pierre 

 Kornmann, Ann. 586 217 (1954); Adolph Butenandt, Ulrich Schiedt 

 and Ernst Biekert, Ann. 586 229, 588 106 (1954); Adolph Butenandt, 

 Ulrich Schiedt, Ernst Biekert and R. Jan. T. Cromartie, Ann. 590 75 

 (1954). (Structure) 



