InChI=1S/C18H18O8S/c1-24-17-8-11(3-2-6-19)7-13-10-15(25-18(13)17)12-4-5-14(20)16(9-12)26-27(21,22)23/h4-5,7-10,19-20H,2-3,6H2,1H3,(H,21,22,23)