InChI=1S/C18H18O8S2/c19-12-13(20)15(16(22)23)26-17(14(12)21)24-6-2-1-3-8-4-5-10(27-8)11-7-9-18(25-9)28-11/h4-5,7,9,12-15,17-21H,2,6H2,(H,22,23)