InChI=1S/C19H25NO7S/c21-18(20-11-14-8-4-5-9-15(14)12-20)17(27-28(24,25)26)16(19(22)23)10-13-6-2-1-3-7-13/h1-3,6-7,14-17H,4-5,8-12H2,(H,22,23)(H,24,25,26)