InChI=1S/C16H20N2O7S/c1-9(2)16(3)15(20)17-13(18-16)12-7-10(8-25-26(21,22)23)5-6-11(12)14(19)24-4/h5-7,9H,8H2,1-4H3,(H,17,18,20)(H,21,22,23)