Bioactive Constituents of the Stem Bark of Mitrephora glabra

Abstract
Bioactivity-guided fractionation of the stem bark of Mitrephora glabra yielded nine compounds, comprising three ent-kaurenoids (1−3), five polyacetylenic acids/esters (4−8), and one aporphine alkaloid, liriodenine (9). The structures of the six new compounds (1−3, 5, 7, and 8) were determined by spectroscopic data interpretation. All compounds were evaluated for their inhibitory activities against a panel of cancer cell lines and a battery of microorganisms.