InChI=1S/C18H21NO7S/c1-25-15-9-6-14(7-10-15)17(26-27(22,23)24)12-19-18(21)11-8-13-4-2-3-5-16(13)20/h2-7,9-10,17,20H,8,11-12H2,1H3,(H,19,21)(H,22,23,24)