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

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

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

N'-[(4-methyl-1-piperidinyl)carbonyl]-N'-(4-piperidinylmethyl)-2-naphthalenesulfonohydrazide

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