InChI=1S/C21H20O13/c22-9-2-1-7(3-10(9)23)6-21(31)18(28)13-11(24)4-8(5-12(13)34-21)32-20-16(27)14(25)15(26)17(33-20)19(29)30/h1-5,14-17,20,22-27,31H,6H2,(H,29,30)