InChI=1S/C17H17NO8S/c19-13-5-7-17(22,8-6-13)9-10-18-16(21)4-2-12-1-3-14(20)15(11-12)26-27(23,24)25/h1-8,11,20,22H,9-10H2,(H,18,21)(H,23,24,25)/b4-2+