Omega-(6,11-Dihydro-11-oxodibenz[b,e]oxepin-2-yl)butyric, -hexanoic, and -octanoic acids were evaluated in the carrageenan paw edema assay. The most active compound, the butyric acid analogue, was 1.80 times more potent than the hexanoic compound, 1.15 times more potent than the octanoic analogue, and 0.43 times as potent as indomethacin.