InChI=1S/C16H20O8/c1-8(7-17)6-9-4-2-3-5-10(9)23-16-13(20)11(18)12(19)14(24-16)15(21)22/h2-6,11-14,16-20H,7H2,1H3,(H,21,22)/b8-6+