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Three antibiotics possessing cytotoxic properties were isolated from a strain of Streptomyces griseus (FCRC-57). One was found to be identical with griseorhodin A. A second, FCRC-57-U, was found to be identical to griseorhodin C. FCRC-57-G is a new antibiotic structurally related to griseorhodins A and C, and is active against KB cells in vitro. The structure of this new antibiotic was determined using mass spectrometry, proton and carbon nuclear magnetic resonance spectroscopy and synthesis.
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Stroshane et al. (1979) studied this question.
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