Clavipines A–C, antiproliferative meroterpenoids with a fused azepine skeleton from the basidiomycete Clitocybe clavipes

Three novel meroterpenoids, clavipines A–C (1–3), possessing a benzoquinone fused to an azepine ring and a ten-membered carbocycle with α,β-epoxy/unsaturated-γ-lactone, were isolated from the basidiomycete Clitocybe clavipes.