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Three novel metabolites, threo-and erythro-telfairic acid [threo-and erythro-(l'E,3'E)-2-(4-carboxyhexa-1,3-dienyl)-3methylsuccinic acid (3a and 3b)l as well as 2,3-didehydrotelfairic anhydride [ (l'E,3'E)-2-(4-carboxyhexa-l,3-dienyl)-3-have been elucidated by chemical and physical methods.

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Metabolites of the Higher Fungi. Part 28. Globoscinic Acid and Globoscin, a Labile Acid-Lactone System from Xylaria globosa and Xylaria obovata. -Globoscinic acid (I) and globoscin (II) are isolated as mixtures of optically active epimers from the culture media of the title fungi. Their structure determination by chemical and physical methods and their labile properties are discussed. -(ADEBOYA, M.; EDWARDS, R. L.; LAESSOEE, T.; MAITLAND, D. J.; WHALLEY, A. S.