InChI=1S/C15H23NO5S/c1-14(21-22(18,19)20)10-6-3-2-4-7-11-15(17)16-12-8-5-9-13-16/h2-4,6,8,12,14H,5,7,9-11,13H2,1H3,(H,18,19,20)/b4-2-,6-3+