InChI=1S/C21H29NO7S/c23-21(22-13-5-6-14-22)8-4-2-1-3-7-18(29-30(24,25)26)11-9-17-10-12-19-20(15-17)28-16-27-19/h9-12,15,18H,1-8,13-14,16H2,(H,24,25,26)/b11-9+