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