Two new phenolic compounds from the lichen growing in Vietnam.

Two new phenolic compounds, cristiferides A-B () together with six known compounds, 2,4-dihydroxyphthalide (), lecanoric acid (), orsellinic acid (), 5-chloroorsellinic acid (), methyl haematommate (), and methyl β-orsellinate () were isolated from the lichen (Taylor) Hale (Parmeliaceae). The structures of isolated compounds were identified from its spectroscopic data and by comparison with the literatures. Compounds - and were evaluated for alpha-glucosidase inhibition. Compounds and revealed potent activity with IC values of 72.66 μM and 48.73 μM, respectively.