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