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A new tocopherol derivative, named (+)-α-tocuspirone (1), along with eleven known compounds, including six tocopherol derivatives (2–7) and five triterpenes (8–12) were isolated from the leaves of Dalbergia velutina. Their structures were determined by spectroscopic analysis especially NMR spectroscopy. The absolute configurations of 1 and 2 were assigned by NOESY experiments and ECD calculations. All isolated compounds were evaluated for their cytotoxicity against five cancer cell lines (KB, HeLa S-3, HT-29, MCF-7 and HepG-2). Dioslupecin A (10) showed potent cytotoxicity against all the five cancer cell lines with IC 50  values in the range of 0.28–2.05 μM. In addition, caffeoxylupeol (12) showed potent cytotoxicity against KB cell with an IC 50  value of 2.28 μM.

A New Tocopherol Derivative and Cytotoxicity from the Leaves of Dalbergia velutina