InChI=1S/C18H18O8S/c19-15(11-10-13-6-2-1-3-7-13)14-8-4-5-9-16(14)25-12-17(18(20)21)26-27(22,23)24/h1-9,17H,10-12H2,(H,20,21)(H,22,23,24)