InChI=1S/C15H18N2O3S/c1-21-7-6-13(15(19)20)17-14(18)8-10-9-16-12-5-3-2-4-11(10)12/h2-5,9,13,16H,6-8H2,1H3,(H,17,18)(H,19,20)/p-1