InChI=1S/C18H20O8S/c1-10-13-7-11(5-6-19)8-14(20)18(13)25-17(10)12-3-4-15(16(9-12)24-2)26-27(21,22)23/h3-4,7-10,17,19-20H,5-6H2,1-2H3,(H,21,22,23)