InChI=1S/C21H20O14/c22-7(3-1-6-2-4-8(23)13(27)12(6)26)11-9(24)5-10(25)18(14(11)28)34-21-17(31)15(29)16(30)19(35-21)20(32)33/h1-5,15-17,19,21,23-31H,(H,32,33)/b3-1+