A new geranylated aromatic compound, 5-[(2′E)-3′,7′-dimethyl-2′,6′-octadienyl]-4-hydroxy-6-methoxy-1-isoindolinone (1), was isolated from the fruiting bodies of the mushroom Hericium erinaceum (Bull.: Fr.) Pers. (Hericiaceae) together with three known sterols, 5α,6α-epoxy-(22E)-ergosta-8(14),22-diene-3β,7α-diol (2), (22E)-ergosta-7,9(11),22-triene-3β,5α,6β-triol (3) and (22E)-ergosta-7,22-diene-3β,5α,6α,9α-tetrol (4). The structure of the new compound was elucidated on the basis of spectral data.
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