InChI=1S/C15H14O8/c1-7(3-12(17)18)9(6-13(19)20)10-4-8(23-2)5-11(16)14(10)15(21)22/h3-6,16H,1-2H3,(H,17,18)(H,19,20)(H,21,22)/b7-3-,9-6+