InChI=1S/C15H21NO5S/c17-15(16-12-8-6-9-13-16)11-7-4-2-1-3-5-10-14-21-22(18,19)20/h1-4,7-8,11-12H,5-6,9-10,13-14H2,(H,18,19,20)/b3-1+,4-2-,11-7+