InChI=1S/C21H29NO7S/c1-17(15-29-30(24,25)26)14-22-21(23)10-8-6-4-2-3-5-7-9-18-11-12-19-20(13-18)28-16-27-19/h4,6-7,9,11-13,17H,2-3,5,8,10,14-16H2,1H3,(H,22,23)(H,24,25,26)/b6-4+,9-7+