InChI=1S/C19H21NO7S/c1-20-18(22)17(27-28(23,24)25)15(13-9-6-10-14(21)11-13)16(19(20)26-2)12-7-4-3-5-8-12/h3-11,15-17,19,21H,1-2H3,(H,23,24,25)