InChI=1S/C20H18O15/c21-7-1-6(2-8(22)11(7)23)19(32)33-9-3-5(17(28)29)4-10(12(9)24)34-20-15(27)13(25)14(26)16(35-20)18(30)31/h1-4,13-16,20-27H,(H,28,29)(H,30,31)