InChI=1S/C21H20O11/c22-6-15-18(27)19(28)20(29)21(32-15)31-9-4-13(25)16-14(5-9)30-7-10(17(16)26)8-1-2-11(23)12(24)3-8/h1-5,7,15,18-25,27-29H,6H2/t15-,18-,19+,20-,21-/m1/s1