3-(Benzyloxy)-2-[3,4-dimethoxy-2,6-bis(3-methylbut-2-en-1-yl)phenyl]-5,7-dimethoxy-8-(3-methylbut-2-en-1-yl)-2,3-dihydro-4H-chromen-4-one AIDS-027804 AIDS027804 Petalostemumol deriv.