InChI=1S/C21H29NO7S/c1-16(2)14-22-21(23)8-6-4-3-5-7-18(29-30(24,25)26)11-9-17-10-12-19-20(13-17)28-15-27-19/h3-4,9-13,16,18H,5-8,14-15H2,1-2H3,(H,22,23)(H,24,25,26)/b4-3+,11-9+