InChI=1S/C23H20O12/c1-33-17-11-13(3-7-15(17)25)5-9-19(28)35-21(23(31)32)20(22(29)30)34-18(27)8-4-12-2-6-14(24)16(26)10-12/h2-11,20-21,24-26H,1H3,(H,29,30)(H,31,32)/b8-4+,9-5+