InChI=1S/C19H21NO7S/c1-20-11-10-17(16-7-4-12-25-16)26-15-6-3-5-14-13(15)8-9-18(24-2)19(14)27-28(21,22)23/h3-9,12,17,20H,10-11H2,1-2H3,(H,21,22,23)