InChI=1S/C22H20O13/c23-11-3-1-2-9(6-11)7-14(19(28)29)33-13-5-4-10(8-12(13)24)21(32)35-22-17(27)15(25)16(26)18(34-22)20(30)31/h1-8,15-18,22-27H,(H,28,29)(H,30,31)/b14-7-