InChI=1S/C19H21NO7S/c1-26-14-3-2-13-5-7-20-6-4-12-8-17(27-28(24,25)11-18(22)23)16(21)9-15(12)19(13,20)10-14/h2-3,5,8-9,14,21H,4,6-7,10-11H2,1H3,(H,22,23)