Five new chlorinated phenyl ethers, russuphelins B (2), C (3), D (4), E (5) and F (6) have been isolated from the mushroom Russula subnigricans Hongo, and their structures were elucidated by spectroscopic and chemical means. Russuphelins B (2), C (3) and D (4) exhibited cytotoxic activity in vitro against P388 leukemia cells.
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Takahashi et al. (1993) studied this question.
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