InChI=1/C20H18O6/c1-11(9-21)2-7-14-16(23)8-17-18(19(14)24)20(25)15(10-26-17)12-3-5-13(22)6-4-12/h2-6,8,10,21-24H,7,9H2,1H3/b11-2+ E7966ABA401F840B