InChI=1S/C17H17NO8S/c19-13-5-8-17(22,9-6-13)10-7-16(21)18-11-15(20)12-1-3-14(4-2-12)26-27(23,24)25/h1-10,15,20,22H,11H2,(H,18,21)(H,23,24,25)/b10-7+