1-[2,4-Dihydroxy-6-methoxy-3,5-bis(3-methylbut-2-en-1-yl)phenyl]ethanone (1), and a new aryl ketone, named acrovestenol (2), were isolated as cyclooxygenase-2 (COX-2) inhibitory principles from a CH2Cl2 extract of the bark of Acronychia pedunculata by a bioassay-guided fractionation procedure. Compound 2 inhibited COX-2 with an IC50 value of 142.0+/-2.15 microM, compared to the COX-2 inhibitory reference compound NS-398 with an IC50 value of 11.3+/-1.12 microM. Compound 1 inhibited COX-2-catalyzed PG biosynthesis with 68% at a concentration of 500 microM. The structures were determined by UV, IR, and 1D- and 2D-NMR, including TOCSY, HSQC-DEPT, and HMBC, and MS investigations.
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