InChI=1S/C18H18O6S/c1-2-17(13-3-7-15(19)8-4-13)18(11-12-24-25(21,22)23)14-5-9-16(20)10-6-14/h2-11,19-20H,12H2,1H3,(H,21,22,23)/b17-2+,18-11?