Gymnoderma melacarpum

Chester DO, Elix JA (1980) A new dibenzofiiran and diphenyl ether from the lichen Gymnoderma melacarpum. Aust J Chem 33 1153-1156... 

The structure of grayanic acid (351) has been confirmed by synthesis 101). It co-occurs with the ring-opened diphenyl ether congrayanic acid (352) in the lichen Gymnoderma melacarpum 47). Interestingly the dibenzo-furan melacarpic acid (353), a product of carbon-carbon oxidative coupling, also occurs in this lichen. 

Only two new dibenzofurans have been isolated from lichens in the past decade. Melacarpic acid (460) was isolated from Gymnoderma melacarpum and the structure established from the H-n. m. r. and mass spectra 47). The... 

A New Dibenzofuran and Diphenyl Ether from the Lichen Gymnoderma melacarpum. Austral. J. Chem. 33, 1153 (1980). 

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See also in sourсe #XX -- [ , ]

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