InChI=1S/C20H18O10/c21-9-4-12(23)10-6-16(30-20-18(27)17(26)14(25)7-28-20)19(29-15(10)5-9)8-1-2-11(22)13(24)3-8/h1-6,14,17-18,20,25-27H,7H2,(H3-,21,22,23,24)/p+1/t14-,17-,18+,20+/m0/s1