InChI=1S/C21H20O9/c1-9-15(24)17(26)18(27)21(28-9)30-20-16(25)14-12(23)7-11(22)8-13(14)29-19(20)10-5-3-2-4-6-10/h2-9,15,17-18,21-24,26-27H,1H3/t9?,15-,17?,18-,21-/m0/s1