It is established, by synthesis, that maturinone is 4,9-dihydro-3,5-dimethylnaphtho[2,3-b]furan-4,9-dione and not the 3,8-dimethyl isomer. The structures assigned to several related sesquiterpenoids in Cacalia decomposita require revision.
P. M. Brown and R. H. Thomson, J. Chem. Soc. C, 1969, 1184 DOI: 10.1039/J39690001184
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