InChI=1S/C20H18O10/c21-10-2-1-8(3-11(10)22)15-6-13(24)17-12(23)4-9(5-16(17)30-15)29-20-19(27)18(26)14(25)7-28-20/h1-6,14,18-23,25-27H,7H2