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One new hopane-type triterpene, indicuen ( 1 ), along with eight known compounds ( 2–9 ) were isolated from the  n -hexane extract of the lichen  Parmotrema indicum  Hale. The chemical structures of isolated compounds were identified by interpretation of their spectroscopic data (1D, 2D NMR and HRESIMS) combined with DFT-NMR chemical shift calculations and subsequent assignment of DP4+ probabilities and by comparison with the literature. Indicuen represents for a rare hopane bearing a 1-carboxyethyl substituent at C-21 in lichens. Compounds  1–3  and  5 – 8  were evaluated for  α -glucosidase inhibition and cytotoxicity against K562 and HepG2 cancer cell lines. Compounds  1 ,  5  and  7  exhibited moderate  α -glucosidase inhibition with IC 50  values of 201.1, 156.3 and 187.4 µM, respectively. Compound  1  also showed weak cytotoxicity toward K562 cell line while others showed no activity.

Indicuen, a new hopane from Parmotrema indicum Hale growing in Vietnam