InChI=1S/C15H14O8/c1-5-3-7-10(15(21-2)22-5)13(18)9-8(23-7)4-6(16)12(17)11(9)14(19)20/h4-5,15-17H,3H2,1-2H3,(H,19,20)/t5-,15+/m0/s1