InChI=1S/C16H21NO5S/c1-2-16(18)12-6-4-3-5-9-14-10-7-8-11-15(17-14)13-22-23(19,20)21/h3-5,7-11,15H,2,6,12-13H2,1H3,(H,19,20,21)/b4-3+,9-5-