InChI=1S/C21H20O10/c22-7-16-18(27)19(28)20(29)21(31-16)11-3-8(23)1-2-10(11)14-6-13(26)17-12(25)4-9(24)5-15(17)30-14/h1-6,16,18-25,27-29H,7H2/t16-,18-,19+,20-,21+/m1/s1