InChI=1S/C16H21NO5S/c1-14-8-6-7-10-15(17-14)9-4-2-3-5-11-16(18)12-13-22-23(19,20)21/h2-4,6-9H,5,10-13H2,1H3,(H,19,20,21)/b3-2+,9-4-