| Summary: | Four novel seconeodolastane diterpenoids, named tricholomalides D–G, were isolated, together with the known tricholomalide C, from the fruiting bodies of <i>Tricholoma ustaloides</i> Romagn., a species belonging to the large <i>Tricholoma</i> genus of higher mushrooms (<i>Basidiomycota</i>, family <i>Tricholomataceae</i>). They were isolated through multiple chromatographic separations, and the structures, including the absolute configuration, were established through a detailed analysis of MS, NMR, and CD spectral data and comparison with related compounds reported in the literature, which has been thoroughly revised.
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