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A new compound 8-chloro-5,6,7-trihydroxy-2-(3-hydroxy-4-methoxyphenethyl)-5,6,7,8-tetrahydro-4H-chromen-4-one (1) was isolated from the Chinese eaglewood [Aquilaria sinensis (Lour.) Gilg]. Its structure was elucidated on the basis of spectral data. Compound 1 showed cytotoxicity against human gastric cancer cell line (SGC-7901) in vitro by MTT method with the IC50 value of 14.6 μg/mL.