InChI=1S/C20H18O10/c21-7-16-17(26)18(27)20(30-16)29-15-6-10-12(24)4-9(22)5-14(10)28-19(15)8-1-2-11(23)13(25)3-8/h1-6,16-18,20-21,26-27H,7H2,(H3-,22,23,24,25)/p+1/t16-,17-,18-,20-/m1/s1