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