anti-fertility [2]. Dalbergia genus has been an abundant source of secondary metabolites,
especially isoflavanes, isoflavones, isoflavanones, neoflavones, anthraquinones,
pterocarpans, triterpenes and cinnamyl esters [3]. Dalbergia velutina, commonly known as
“Khruea khang khwai” in Thai, is a creeping plant mainly found in the northeastern region of
Thailand. This is the first report on chemical constituents from this plant. Herein, we report
the isolation, identification and cytotoxicity of three new pterocarpans, kaennavelutinans A–C
(1–3) and three known pterocarpans (4–6) (Fig. 1). Their structures were identified by
interpretation of their spectroscopic data as well as comparison with those reported in the
literature. All isolated compounds were evaluated for their cytotoxicity against KB and HeLa
cell lines.