InChI=1S/C17H18O9S/c1-24-8-10-3-2-9(4-15(10)26-27(21,22)23)17-14(20)7-12-13(19)5-11(18)6-16(12)25-17/h2-6,14,17-20H,7-8H2,1H3,(H,21,22,23)