InChI=1S/C17H20O9/c1-25-17(16(23)24)7-12(20)15(22)13(8-17)26-14(21)5-3-9-2-4-10(18)11(19)6-9/h2-6,12-13,15,18-20,22H,7-8H2,1H3,(H,23,24)/b5-3-