InChI=1S/C18H19NO7S/c1-24-14-9-7-12(8-10-14)15(26-27(21,22)23)11-19-18(20)17-16(25-17)13-5-3-2-4-6-13/h2-10,15-17H,11H2,1H3,(H,19,20)(H,21,22,23)