Pongamone A-E, five flavonoids from the stems of a mangrove plant, Pongamia pinnata

Chemical investigation on the stems of the mangrove plant, Pongamia pinnata, resulted in the isolation and characterization of five pongamones A-E (1-5) together with 16 known flavonoid derivatives. Their structures were determined on the basis of spectroscopic analyses and by comparison of their spectroscopic data with those reported in the literature.