New phenolic glycosides with cyclooxygenase inhibition from the roots of Tecoma mollis

Abstract Three new phenolic glycosides ( 1–3 ) together with nine known ones were isolated from the roots of Tecoma mollis using DPPH radical scavenging bioassay-guided chromatographic separation. The structures of the new compounds were established using extensive spectroscopic data and HR-MS. The antioxidant, COX-2 inhibition, and cytotoxic activities were evaluated for the isolated compounds. Compound 4 displayed the strongest radical scavenging activity relative to ascorbic acid with IC 50 8.7 μM. Compounds 5 , 6 , and 10 showed promising COX-2 inhibitory action, IC 50 values of 11.3 μM, 9.4 μM, and 13.4 μM, respectively. All compounds exhibited weak cytotoxic activity against Hela and A549 cancer cell lines.