Abstract
Clavipyrrine A (1), a novel polycyclic nitrogenous meroterpenoid with a pyrrolo[1,2-a]imidazole and a 10-membered carbocycle fused with an α,β-epoxy-γ-lactone, was isolated from Clitocybe clavipes, a basidiomycete. X-ray crystallography and spectroscopic analysis were used to fully elucidate its structure. The biosynthetic origin of the pyrrole unit in this nitrogenous meroterpenoid was identified by incorporating 15N-labeled γ-aminobutyric acid. Compound 1 displayed promising anti-glioma activities and induced glioma cell apoptosis through inhibiting the JAK/STAT3 pathway and reinforcing SOCS1/3.
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