InChI=1S/C19H23NO7S/c1-20-18(26-2)16(14-11-7-4-8-12-14)15(13-9-5-3-6-10-13)17(19(21)22)27-28(23,24)25/h3-12,15-18,20H,1-2H3,(H,21,22)(H,23,24,25)