InChI=1S/C16H21NO5S/c1-3-15(18)12-16(22-23(19,20)21)11-7-6-10-14-9-5-4-8-13(2)17-14/h4-8,10-11,16H,3,9,12H2,1-2H3,(H,19,20,21)/b10-6-,11-7+