InChI=1S/C23H20O8/c1-23(2,31-18(27)10-5-12-3-7-14(24)11-15(12)25)22-20(28)19-16(29-22)8-4-13-6-9-17(26)30-21(13)19/h3-11,20,22,24-25,28H,1-2H3/b10-5+