Studies on the constituents from the fruits of Phaleria macrocarpa.

From the fruits of Phaleria macrocarpa, icariside C(3) (1), phalerin (2), and mangiferin (3) were isolated and their structures were identified on the basis of spectroscopic data. Icariside C(3) (1) showed a slow vasorelaxant activity against noradrenaline-induced contraction of isolated rat aorta. The structure of phalerin (2) was revised as 2,4',6-trihydroxy-4-methoxybenzophenone-2-O-beta-D-glucoside.