InChI=1S/C17H19NO8S/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/h1-6,8-9,15,20,22H,7,10-11H2,(H,18,21)(H,23,24,25)