methyl 4-[(1-{[cyclohexyl(methyl)amino]carbonyl}hydrazino)methyl]-1-piperidinecarboxylate

N-cyclohexyl-N-methyl-2-(2-naphthylsulfonyl)-1-(4-piperidinylmethyl)-1-hydrazinecarboxamide

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

methyl 4-[(2-(tert-butoxycarbonyl)-1-{[cyclohexyl(methyl)amino]carbonyl}hydrazino)methyl]-1-piperidinecarboxylate

methyl 4-{[1-{[cyclohexyl(methyl)amino]carbonyl}-2-(2-naphthylsulfonyl)hydrazino]methyl}-1-piperidinecarboxylate