InChI=1S/C21H20O10/c1-28-15-4-9(2-3-12(15)24)20-16(30-21-19(27)18(26)17(8-22)31-21)7-11-13(25)5-10(23)6-14(11)29-20/h2-7,17-19,21-22,26-27H,8H2,1H3,(H2-,23,24,25)/p+1/t17-,18-,19+,21+/m1/s1