InChI=1S/C21H20O13/c22-5-11-13(26)15(28)17(30)21(33-11)34-20-16(29)14(27)12-9(25)4-10(32-19(12)18(20)31)6-1-2-7(23)8(24)3-6/h1-4,11,13,15,17,21-24,26-31H,5H2/t11-,13-,15+,17-,21+/m1/s1