Keywords: Biosynthesis / Biaryls / Fungal pre-anthraquinones / Oxidative phenolic coupling / Quantum chemical CD calculationsThe absolute stereostructures of phlegmacins A 1 (3a) and B 1 (3b) were determined by biosynthetic studies, quantum chemical CD calculations, and NOE experiments. In Cortinarius odorifer these compounds are formed by regioselective oxidative dimerization of (R)-torosachrysone (R-2).
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