Bioassay-guided fractionation of an MeCOEt extract of Frullania nisqua
llensis Sull. has furnished a DNA-damaging sesquiterpene, costunolide
(1), and two inactive compounds, a sesquiterpene (-)-frullanolide (2)
and a tridepside tenuiorin (3). C-13-NMR data of 3 are reported.