InChI=1S/C22H18O7/c1-7-4-8(23)14-17-13(7)11(26)6-12-21(2,3)20(28)16-10(25)5-9(24)15(19(14)27)18(16)22(12,17)29/h4-6,11,23-26,29H,1-3H3/t11-,22+/m0/s1