InChI=1S/C16H20N2O7S/c1-8(2)16(4)15(20)17-13(18-16)11-10(14(19)24-5)7-6-9(3)12(11)25-26(21,22)23/h6-8H,1-5H3,(H,17,18,20)(H,21,22,23)