Biflavonoids from Lonicera japonica

Two biflavonoids, 3′-O-methyl loniflavone [5,5″,7,7″-tetrahydroxy 3′-methoxy 4′,4‴-biflavonyl ether] and loniflavone [5,5″,7,7″,3′-pentahydroxy 4′,4‴-biflavonyl ether] along with luteolin and chrysin were isolated and characterized from the leaves of Lonicera japonica.