InChI=1S/C14H15NO7S/c16-10-12(22-23(19,20)21)7-9-14(18)15-13(17)8-6-11-4-2-1-3-5-11/h1-5,7,9-10,12H,6,8H2,(H,15,17,18)(H,19,20,21)/b9-7+