Chemical constituents and bioactivities of Clinacanthus nutans aerial parts

Four new sulfur-containing compounds, named clinamides A-C (1-3), and 2-cis-entadamide A ( 4), were isolated together with three known compounds from the bioactive ethanol extract of the aerial parts of Clinacanthus nutans. These secondary metabolites possess sulfur atoms and acrylamide functionalities. The structures of the isolated components were established by interpretation of their spectroscopic data, especially 1D and 2D NMR.