InChI=1S/C20H27NO6S/c1-16(2)15-21-20(23)11-9-7-5-3-4-6-8-10-17-12-13-18(22)19(14-17)27-28(24,25)26/h5,7-14,16,22H,3-4,6,15H2,1-2H3,(H,21,23)(H,24,25,26)/b7-5+,10-8+,11-9+