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The structure determination of four new biologically active non-halogenated metabolites isolated from submerged cultures of the ascomycete Lachnum papyraceum is described. The compounds are structurally related to the antibiotic mycorrhizin A: (l'Z)-Dechloromycorrhizin A (12), a stereoisomer of dechloromycorrhizin A (5) previously isolated from the same fungus, as well as papyracon A (13), papyracon B (14) and papyracon C (15) containing an exocyclic double bond. The amounts of the latter three increased significantly when CaBr2 was added to the culture medium. The structures were determined by spectroscopic methods.

journal of antibiotics

New Metabolites with Nematicidal and Antimicrobial Activities from the Ascomycete Lachnum papyraceum(Karst.) Karsts. VI. Structure Determination of Non-halogenated Metabolites Structurally Related to Mycorrhizin A.