InChI=1S/C21H20O11/c22-11-4-2-1-3-9(11)5-6-12(23)15-13(24)7-10(8-14(15)25)31-21-18(28)16(26)17(27)19(32-21)20(29)30/h1-8,16-19,21-22,24-28H,(H,29,30)/b6-5+