1 F1J (2s)-4-(4-fluorobenzyl)-N-(2-sulfanylethyl)piperazine-2-carboxamide 1.000 2 F1K (2s)-4-(4-fluorobenzyl)-N-(3-sulfanylpropyl)piperazine-2-carboxamide 0.864 3 QCW ~{N}-methyl-2-oxidanylidene-1-(phenylmethyl)pyridine-3-carboxamide 0.727