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