The isolation and characterization of rubradirin B.

@article{Hoeksema1978TheIA,
  title={The isolation and characterization of rubradirin B.},
  author={Herman Hoeksema and C. Lewis and Stephen A. Mizsak and J A Shiley and Daniel R. Wait and Howard A. Whaley and Gary E. Zurenko},
  journal={The Journal of antibiotics},
  year={1978},
  volume={31 10},
  pages={
          945-8
        }
}
Rubradirin B, C40H33N3O15, was separated from other components of the rubradirin complex by chromatographic and crystallization procedures. The spectrum of antibacterial activity is similar to that of rubradirin, but the antibiotic is less active. 
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The antibiotic rubradirin, C48H46N4O20, and the rubransarols are shown to be unique ansamycins which are isomeric at a double bond in the large ring. Expand
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