InChI=1S/C21H29NO7S/c1-16(2)14-22-21(23)10-6-5-9-18(29-30(24,25)26)8-4-3-7-17-11-12-19-20(13-17)28-15-27-19/h3,5,7,9,11-13,16,18H,4,6,8,10,14-15H2,1-2H3,(H,22,23)(H,24,25,26)/b7-3+,9-5+