InChI=1S/C15H19FN2O2S/c1-9(10-5-7-11(16)8-6-10)17-13-18-12(19)15(4,21-13)14(2,3)20/h5-9,20H,1-4H3,(H,17,18,19)/t9-,15+/m0/s1