A new stilbenoid, methyl 2,4-dihydroxy-6-(4-hydroxyphenethyl)-3-methylbenzoate (1), along with 11 known compounds, cirsimaritin (2), cirsiliol (3), quercetin (4), apigenin (5), acacetin (6), genkwanin (7), luteolin (8), caffeic acid (9), esculetin (10), alternariol (11), and alternariol-5-O-methyl ether (12), was isolated from the 70 EtOH extract of Caryopteris incana. The structures of these compounds were established via extensive spectroscopic techniques, including 1D, 2D NMR, and HR-ESI-MS. Compound 1 exhibited moderate cytotoxic activity against human HepG2 and SMMC-7721 hepatoma cell lines with IC50 values of 21.3 and 20.1 μM, respectively.
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