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