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Cinnamic, benzoic, and m-hydroxybenzoic acids and benzophenone (1) are efficient precursors to mangostin (3).

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Some polyhydroxypolyporic acids have been prepared and tested as antioxidants for linoleic acid and methyl linoleate: their mode of action is discussed. 3',4', 5'-Trihydroxy-4"-t-butylpolyporic acid proved to be outstanding.

The 13C NMR spectra of linderone (l), lucidone (Z), methyllinderone (3), methyllucidone (4), demethyllinderone

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