InChI=1S/C15H21NO5S/c1-2-3-4-5-6-8-11-14(21-22(18,19)20)15(17)16-12-9-7-10-13-16/h2-6,8-9,12,14H,7,10-11,13H2,1H3,(H,18,19,20)/b3-2+,5-4+,8-6-