InChI=1S/C16H16O11/c17-7(3-6-1-2-8-9(4-6)25-5-24-8)15(23)27-16-12(20)10(18)11(19)13(26-16)14(21)22/h1-4,10-13,16-20H,5H2,(H,21,22)/b7-3+