Pfizer Handbook of Microbial Metabolites 464 



940 Indigo, C16H10O2N2, blue powder with a coppery luster, sublimes. 



Schizophyllum commune mutant 

 Ammonium ion was the only nitrogen source. 

 Philip G. Miles, Henning Lund and John R. Raper, Arch. 

 Bioche7n. and Biophys. 62 1 (1956). 



941 Chetomin, Ci(5Hi704N3S2 (proposed), amorphous white powder, 



m.p. 218-220° (dec), [ajn'^ +360° (c 1 in chloroform). 



A neutral compound. Positive indole, Hopkins-Cole, 

 negative biuret, Millon. 



Chaetomium cochlioides 



Walton B. Geiger, Jean E. Conn and Selman A. Waksman, 

 ;. Bacterial. 48 531 (1944). (Isolation) 



Walton B. Geiger, Arch. Biochem. 21 125 (1949). 



942 Violacein, C20H13O3N3, violet-black microcrystals, m.p. >350° 



(dec). 



HO C=CH 



Co 



NH C 



c ^1 — 



O X N 

 O H 



Chromohacterium, violaceum. 



F. M. Strong, Science 100 287 (1944). 



R. T. S. Beer, Angew. Chem. 69 676 (1957). 



J. A. Ballantine, C. B. Barrett, R. J. S. Beer, B. G. Boggiano, 

 K. Clarke, Stephen Eardley, B. E. Jennings and Alexander 

 Robertson, /. Chem. Soc, 2222 (1957) and preceding papers 

 in this series. 



J. A. Ballantine, R. T. S. Beer, D. J. Crutchley, G. M. Dodd 

 and D. R. Palmer, /. Chem. Soc, 2292 (1960). (Synthesis) 



R. D. Demoss and N. R. Evans, /. Bacteriol. 79 729 (1960). 

 (Biosynthesis) 



