InChI=1S/C17H17NO8S/c19-13-5-1-11(2-6-13)9-10-18-15(21)8-4-12-3-7-14(20)17(16(12)22)26-27(23,24)25/h1-8,19-20,22H,9-10H2,(H,18,21)(H,23,24,25)/b8-4+