InChI=1S/C16H19NO5S/c1-2-3-4-5-6-7-9-12-15(22-23(19,20)21)16(18)17-13-10-8-11-14-17/h1,7,9-10,13,15H,5-6,8,11-12,14H2,(H,19,20,21)/b9-7-