383 Polypeptides and Related Compounds 



Below is shown one of the peptide side-chains of actino- 

 mycin C3 to permit comparison with etamycin, etc. 



" CH.. 



Streptomyces antibioticus, S. chrysomallus 

 H. Brockmann, G. Bohnsack, B. Franck, H. Grone, H. Mux- 

 feldt and C. Siiling, Angew. Chem. 68 70 (1956) and preced- 

 ing papers. (Structure) 



H. Brockmann, W. Sunderkotter, K. W. Ohly and P. Boldt, 

 Naturwissenschaften 47 230 (1960). 

 ' H. Brockmann and L. Lackner, ibid., 47 230 (1960). 



794 Actinomycin C^ (D,IV,Xi,Bi,Ii) C(.iHjj„Oip,Nio red prisms, m.p. 

 241° (235.5-236.5) (dec.) [a],r" -349° ±10° (337°). 



\ 

 ^L-Thre — D-Val — L-Pro — Sar — L-Meval — O Indicates position 



of lactone not 



— L-Thre — D-Val — L-Pro — Sar — L-Meval — O , proved 



Where 



r \° NH, 



N 



CH3 ° 



Streptomyces chrysomallus, S. antibioticus; S. parvul- 

 lus 



A. W. Johnson and A. B. Mauger, Biochem. J. 73 535 

 (1959). 



Hans Brockmann and Hans-Sieghard Petras, Naturwis- 

 senschaften 46 400 (1959). 



