Abstract
Three new flavonoids, lawsochrysin ( 1), lawsochrysinin ( 2), and lawsonaringenin ( 3) were isolated from the leaves of Lawsonia alba Lam. along with four flavonoids 3′,4′-dimethoxy flavone ( 4), 7-hydroxy flavone ( 5), 3,3′,4′,7-tetrahydroxy flavanone ( 6) and rhoifolin ( 7) hitherto unreported from this genus. Their structures were elucidated on the basis of spectroscopic evidences. Compounds ( 3) and ( 6) showed a good urease inhibition activity IC 50 = 139.1 ± 0.77 and 184.53 ± 0.61 μM respectively, ( 6) also showed a DPPH radical scavenging activity with IC 50 = 33.83 μM.
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