InChI=1S/C21H8O12/c22-5-1-3-7(14(26)12(5)24)9-11-10-8-4(2-6(23)13(25)16(8)33-21(11)30)20(29)32-18(10)15(27)17(9)31-19(3)28/h1-2,22-27H