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