InChI=1S/C16H18N2O2S/c1-9(2)14-13(16(19)20)18-15(21-14)12-7-10-5-3-4-6-11(10)8-17-12/h3-6,9,12,17H,7-8H2,1-2H3,(H,19,20)/t12-/m0/s1