InChI=1S/C16H20O9/c1-22-6-9-13(24-9)7-2-4-8(5-3-7)23-16-12(19)10(17)11(18)14(25-16)15(20)21/h2-5,9-14,16-19H,6H2,1H3,(H,20,21)