Isoprenylcysteine carboxyl methyltransferase (Icmt) is enzyme target in anticancer drug discovery. An Icmt natural product high-throughput screening campaign was conducted and a hit extract from the roots of Hovea parvicalyx was identified. 2'-Methoxy-3'-prenyl-licodione and 2'-methoxy-3',3''-diprenyl- licodione, two prenylated b-hydroxychalcone compounds, together with the known flavanone (S)- glabrol, were isolated and identified as bioactive constituents. Their structures were determined largely by 1D and 2D NMR spectroscopy.