1,11-Di-(3,5-dihydroxyphenoxy)benzofuro(3,2-a)dibenzo(b,e)(1,4)-dioxin-2,4,8,10,14-pentaol 128129-56-6 Benzo(b)benzofuro(3,2-f)(1,4)benzodioxin-1,3,6,10,12-pentol, 4,9-bis(3,5-dihydroxyphenoxy)- Phlorofucofuroeckol A