InChI=1S/C17H18O8S/c1-4-12(25-26(20,21)22)10-7-14(19)23-16-9-5-6-17(2,3)24-13(9)8-11(18)15(10)16/h5-8,12,18H,4H2,1-3H3,(H,20,21,22)