3,9-Dihydroxy-4-(gamma,gamma-dimethylallyl)pterocarpene 4-(3-Methyl-but-2-enyl)-6H-benzo[4,5]furo[3,2-c]chromene-3,9-diol 4-(3-methylbut-2-en-1-yl)-6H-[1]benzofuro[3,2-c]chromene-3,9-diol 6H-benzofuro[3,2-c][1]benzopyran-3,9-diol, 4-(3-methyl-2-butenyl)- Erypoegin E InChI=1/C20H18O4/c1-11(2)3-5-14-17(22)8-7-15-19(14)23-10-16-13-6-4-12(21)9-18(13)24-20(15)16/h3-4,6-9,21-22H,5,10H2,1-2H