InChI=1S/C17H20O9/c1-17(7-18)6-5-8-9(3-2-4-10(8)26-17)24-16-13(21)11(19)12(20)14(25-16)15(22)23/h2-6,11-14,16,18-21H,7H2,1H3,(H,22,23)