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