InChI=1S/C19H23NO8S/c1-20-18(27-2)16(13-9-6-10-14(11-13)28-29(24,25)26)15(17(21)19(22)23)12-7-4-3-5-8-12/h3-11,15-18,20-21H,1-2H3,(H,22,23)(H,24,25,26)