InChI=1S/C21H18O10/c22-7-14-16(24)17(25)18(26)21(31-14)28-9-2-4-11-13(6-9)30-20(27)15-10-3-1-8(23)5-12(10)29-19(11)15/h1-6,14,16-18,21-26H,7H2