InChI=1S/C20H18O10/c21-11-2-1-8(3-13(11)23)19-14(24)6-10-12(22)4-9(5-16(10)30-19)29-20-18(27)17(26)15(25)7-28-20/h1-6,15,17-18,20,25-27H,7H2,(H3-,21,22,23,24)/p+1