methyl 3-{[2-(2-naphthylsulfonyl)-1-(1-piperidinylcarbonyl)hydrazino]methyl}-1-piperidinecarboxylate

methyl 3-{[2-(tert-butoxycarbonyl)-1-(1-piperidinylcarbonyl)hydrazino]methyl}-1-piperidinecarboxylate

N'-(1-piperidinylcarbonyl)-N'-(3-piperidinylmethyl)-2-naphthalenesulfonohydrazide

N,N'-bis-Boc-S-methyl-isothiourea

methyl 3-{[1-(1-piperidinylcarbonyl)hydrazino]methyl}-1-piperidinecarboxylate