InChI=1S/C11H15NO7S/c1-11(12,10(13)14)6-7-3-4-8(18-2)9(5-7)19-20(15,16)17/h3-5H,6,12H2,1-2H3,(H,13,14)(H,15,16,17)/t11-/m0/s1