Usnea undulata

Elix JA, Crook CE (1992) The joint occurrence of chloroxanthones in lichens, and a further thirteen new lichen xanthones. Bryologist 95 52-64 Elix JA, David F (1991) New depsides from the lichen Biatora sorediosa. Aust J Chem 44 1643-1647 Elix JA, Engkanian U (1975) The structure of galbinic acid. A depsidone from the lichen Usnea undulata. Aust J Chem 28 1793-1797... 

Galbinic acid (432) from Usnea undulata is an acetyl derivative of salazinic acid (291) from which it can be prepared by heating it in acetic acid containing TVW-dimethylformamide (114). 

Elix, J. A., and U. Engkaninan The Structure of Galbinic Acid. A Depsidone from the Lichen Usnea undulata. Austral. J. Chem. 28, 1793 (1975). 

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See also in sourсe #XX -- [ ]

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