for the following products
4-(Aminothioxomethyl)-1-piperidinecarboxylic acid 1,1-dimethylethyl ester | Piperidine-4-thiocarboxamide, N1-boc protected | tert-Butyl 4-thiocarbamoylpiperidine-1-carboxylate and tert-Butyl 4-(aminocarbothioyl)tetrahydropyridine-1(2H)-carboxylate