InChI=1S/C15H14O8/c1-15(21-2)13-6(3-4-22-15)11(17)9-8(23-13)5-7(16)12(18)10(9)14(19)20/h5,16,18H,3-4H2,1-2H3,(H,19,20)/t15-/m1/s1