InChI=1S/C17H17NO8S/c19-13-3-1-12(2-4-13)15(26-27(23,24)25)11-18-16(21)7-10-17(22)8-5-14(20)6-9-17/h1-10,15,19,22H,11H2,(H,18,21)(H,23,24,25)/b10-7+