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