InChI=1S/C21H20O10/c22-7-15-18(26)19(27)20(28)21(31-15)30-9-5-13(24)16-14(6-9)29-8-11(17(16)25)10-3-1-2-4-12(10)23/h1-6,8,15,18-24,26-28H,7H2