Sterol Constituents from the Fruit Bodies of Grifola frondosa (FR.) S. F. GRAY.

Four new sterols, 5α, 6α-epoxy-(22E, 24R)-ergosta-8(14), 22-diene-3β, 7β-diol (1), (22E, 24R)-ergosta-8, 22-diene-3β, 5α, 6β, 7α-tetrol (2), (22E, 24R)-ergosta-7, 9(11), 22-triene-3β, 5α, 6β-triol (3) and 3β, 5α, 6β-trihydroxy-(22E, 24R)-ergost-22-en-7-one (4), have been isolated from the fruit bodies of Grifola frondosa (FR.) S. F. GRAY (Polyporaceae)together with fourteen known ones (5-18), of which two (5 and 6) are reported for the first time from a natural source. The structures of these compounds were elucidated on the basis of spectral data.

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