InChI=1S/C21H29NO7S/c1-16(2)14-22-21(23)13-18(29-30(24,25)26)9-7-5-3-4-6-8-17-10-11-19-20(12-17)28-15-27-19/h6-12,16,18H,3-5,13-15H2,1-2H3,(H,22,23)(H,24,25,26)/b8-6+,9-7+