Inhibitors of osteoclastogenesis from Lawsonia inermis leaves.

Ten phenolic compounds (1-10) were isolated from a methanol extract of Lawsonia inermis leaves including two new ones, lawsoniasides A (1) and B (2). Their structures were elucidated by spectroscopic methods (NMR and FTICRMS) in combination with acid hydrolysis and GC analyses. Compounds 4 and 5 showed a significant inhibition on receptor activator for nuclear factor-kappaB ligand-induced osteoclast formation in murine bone-marrow macrophages.