Pfizer Handbook of Microbial Metabolites 604 



Streptomyces racemochromogenes n. sp. 

 Hyozo Taniyama and Shoji Takemura, J. Pharm. Soc. Japan 

 77 1210, 1217 (1957); 78 742 (1958). 



1259 Ractinomycin A, C33H3nOi4N3, orange needles, m.p. browns 



-157°, blackens at 205°. 



Negative ninhydrin, biuret, Sakaguchi, Millon. Posi- 

 tive Tollens, Molisch, FeClg. Decolorizes KMn04. De- 

 colorized by HoOo. Alkali-unstable. Turns purple above 

 pH 6.5. Contains no amino acids. 



1260 Ractinomycin B, reddish orange needles, m.p. 172-175° (dec). 



Negative FeClg. 



The ractinomycins are said to resemble the actinomy- 

 cins in some respects. 



Streptomyces sp. similar to S. phaeochromogenes 



Ryozo Utahara, Hideo Oyagi, Koki Yagishita, Yoshiro Okami 

 and Hamao Umezawa, J. Antibiotics (Japan) 8A 132 (1955). 



Ryozo Utahara, ibid. lOA 115 (1957). 



S. Wakiki et al., Antibiotics and Chemotherapy 8 228 

 (1958). 



1261 Raisnomycin, dark yellow basic material, insoluble in water. 



The hydrochloride and disulfate are slightly soluble. The 

 impure material does not have an end absorption in U.V. 



Streptomyces kentuckensis 



Fred S. Barr and Paul E. Carman, Antibiotics and Chemo- 

 therapy 6 286 (1956). 



1262 Rammacin, C26H43O8, crystalline, m.p. 235°, Mol. Wt. 499. 



Negative Brs; positive benzenoid. 



Streptomyces sp. 



K. Ahmad and M. F. Islam, Nature 176 646 (1955). 



1263 Ramycin (Mol. Wt. 478, contains only carbon, hydrogen and 



oxygen), 'colorless plates, m.p. 158° (dec), optically in- 

 active. 



Structural features: 



A non-phenolic hydroxy acid with one or more carbon- 

 carbon double bonds. 



Mucor ramannianus 



P. J. van Dijck and P. deSomer, J. Gen. Microbiol. 18 377 

 (1958). 



1264 Raromycin, m.p. 211-213° C 57.97, H 8.46, N 0.44, O 33.13 by 



difference. 



