1,3-benzenediol, 5-(6-hydroxy-2-benzofuranyl)-4-(3-methyl-2-butenyl)- 5-(6-hydroxy-1-benzofuran-2-yl)-4-(3-methylbut-2-en-1-yl)benzene-1,3-diol InChI=1/C19H18O4/c1-11(2)3-6-15-16(8-14(21)9-17(15)22)19-7-12-4-5-13(20)10-18(12)23-19/h3-5,7-10,20-22H,6H2,1-2H