Fungal products. Part. IV. The structure of heveadride, a new nonadride from Helminthosporium heveae

Abstract
Heveadride, a fungal product from Helminthosporium heveae, has been shown to be the nonadride (IV)(8-ethyl-7-propylcyclonona-1,5-diene-1,2,5,6-tetracarboxylic 1,2:5,6-dianhydride) from its spectroscopic properties and its oxidation to succinic acid and to a series of acids [corresponding to the methyl esters (V), (VI), (VII), (X), (XII) or (XIII), and (XIV)].

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