ethyl 3-{[3-(dimethylamino)propyl]amino}propanoate

tert-butyl 2-methyl-3-(methylamino)propanoate

tert-butyl 2-methyl-3-{[(thiophen-2-yl)methyl]amino}propanoate

methyl 3-[(2-methylpropyl)amino]butanoate

methyl 3-[(3-butoxypropyl)amino]butanoate

methyl 3-{[2-(pyrrolidin-1-yl)ethyl]amino}butanoate

methyl 3-[(2-methoxyethyl)amino]-2-methylpropanoate

methyl 3-[(3-methylbutyl)amino]butanoate

methyl 3-[(3-methoxypropyl)amino]-2-methylpropanoate

methyl 3-{[(4-fluorophenyl)methyl]amino}butanoate

methyl 3-{[2-(diethylamino)ethyl]amino}-2-methylpropanoate