InChI=1S/C18H18O9S/c1-24-14-8-13(19)15-16(20)11(9-26-18(15)17(14)25-2)6-10-4-3-5-12(7-10)27-28(21,22)23/h3-5,7-8,11,19H,6,9H2,1-2H3,(H,21,22,23)