InChI=1S/C14H20N2O7S/c1-21-11-8-9(4-5-10(11)23-24(18,19)20)12-13(22-12)14(17)16-7-3-2-6-15/h4-5,8,12-13H,2-3,6-7,15H2,1H3,(H,16,17)(H,18,19,20)