The 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 ). (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)
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