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Chemical investigation of the lichen  Parmotrema tinctorum  (Nyl.) Hale led to the isolation of two new phenolic compounds, 2-ethylhexyl orsellinate ( 1 ) and tinctorinone ( 2 ). The structures were determined by analysis of their MS and NMR data as well as by comparison with literature data. The 2-ethylhexyl ester group of 2-ethylhexyl orsellinate is uncommon among lichen metabolites. Tinctorinone revealed strong inhibition towards α-glucosidase.

Two new phenolic compounds from the Vietnamese lichen Parmotrema tinctorum