3^5 Polypeptides and Related Compounds 



763 Esperin, CsgH^-OnN-, colorless crystals, m.p. 238° (dec ) [al,^'^ 



-24° (c 0.66 in methanol). 



CH,CH,COOH 



CHslCH.lgCHCH.CONHCHCONHCHCONHCHCONHCHCONHCHCOOH 



I I I 



CH CH, 



O OC— CH., / \ CH- I 



CHa CH3 I CH 



CH /\ 



/ \ CH3 CH3 



CH3 CH3 



Bacillus mesentericus 



Hiroshi Ogawa and Teiichiro Ito, ]. Agr. Chem. Soc. Japan 

 24 191 (1950). (Isolation) 



Idem., ibid. 26 432 (1952). 



Idem., Bull. Agr. Chem. Soc. (Japan) 23 536 (1959). 

 (Structure) 



764 Actinochrysin, C4oHr.-0„N-, a brick red pigment. 



Similar to but distinct from actinomycins. A weak 

 base with two acid groups. Molecular weight 811. Solu- 

 ble in acetone. 



Streptomyces chrysomallus 



Hans Brockmann and Arnold Bohne, German Patent 912,- 

 010 (1954). (Chem. Abstr. 52 12334g) 



765 Grisein, C4i,H(;i02„Ni„SFe, red, amorphous powder. 



Isolated from acid hydrolysate: 



O H 



I ll + Glutamic Acid 



y^.^J^ + '^n unidentified amino acid 

 CH, II 



3-Methyluracil 



The iron is Fe'" and can be removed and readded to the 

 complex. 



Streptomyces griseus 



The Russian antibiotic, albomycin, produced by Strepto- 

 myces subtropicus seems to be similar to or identical with 

 grisein. 



