InChI=1S/C17H17NO7S/c19-16(11-13-6-8-14(9-7-13)25-26(22,23)24)18-15(17(20)21)10-12-4-2-1-3-5-12/h1-9,15H,10-11H2,(H,18,19)(H,20,21)(H,22,23,24)