InChI=1S/C16H19NO5S/c1-2-3-4-5-6-8-11-15(22-23(19,20)21)14-16(18)17-12-9-7-10-13-17/h1,8-9,11-12,15H,5-7,10,13-14H2,(H,19,20,21)/b11-8-