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Occurrence of Bis-Noryangonin in Gymnopilus spectabilis

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    Mycologia

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    Thus, the crude methanolic extract, partitions phases, and fractions of the wild mushrooms G. imperialis were dereplicated. According to the literature, some species of Gymnopilus can biosynthesize styrylpyrones such as hispidin and bisnoryangonin with reported antioxidant and antitumor activities (Hatfield and Brady, 1969; I.-K. Lee et al., 2008). In addition to styrylpyrones, the occurrence of oligoisoprenoids, molecules that contain between 45 and 60 atoms of carbon, were also reported as major metabolites in G. spectabilis s. auct (I.-K. Lee et al., 2008).

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    Two known styryl-pyran-2-ones, 5,6-dehydrokawain73 (62), and 4′-hydroxy-5,6-dehydrokawain74 (68), have been isolated from ethanolic extracts of the seeds of Alpinia blepharocalyx, and the latter (68) has shown significant antiproliferative activity against murine colon 26-L5 carcinoma (ED50: 20.7 μM) and human HT-1080 fibrosarcoma (ED50: 20.1 μM) cells.75 Two new dihydrostyrylpyrones (70 and 71) and a styrylpyrone (72), together with a known styrylpyrone (69), have been isolated from the ethyl acetate-soluble fraction of an aqueous ethanol (1:4) extract of the herb Polygala sabulosa,76 which is used as a topical anaesthetic in folk medicine. 5,6-Dihydro-2-pyranones, dihydromethysticin 73 and methysticin 74, have been reported from the root extracts of Kava.77

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