Abstract
Repandiol, a new cytotoxic diepoxide has been isolated from the mushrooms Hydnum repandum and H. repandum var. album. The chemical structure was elucidated as (2R, 3R, 8R, 9R)-4, 6-decadiyne-2, 3 : 8, 9-diepoxy-1, 10-diol on the basis of spectroscopic analysis. The structure was confirmed by the synthesis of optically active repandiol. Repandiol displayed potent cytotoxic activity against various tumor cells.