InChI=1S/C16H20O9/c1-7(8-5-3-2-4-6-8)12(14(20)21)24-16-11(19)9(17)10(18)13(25-16)15(22)23/h2-7,9-13,16-19H,1H3,(H,20,21)(H,22,23)