InChI=1/C21H20O11/c22-9-3-1-8(2-4-9)12-7-11(24)15-13(30-12)5-10(23)6-14(15)31-21-18(27)16(25)17(26)19(32-21)20(28)29/h1-6,12,16-19,21-23,25-27H,7H2,(H,28,29)/t12-,16?,17?,18?,19?,21?/s2