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