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

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

ethyl 3-[(3-phenylpropyl)amino]propanoate

ethyl 3-[(2,2-diethoxyethyl)amino]propanoate

tert-butyl 3-(cyclohexylamino)-2-methylpropanoate

tert-butyl 3-[(2-methoxyethyl)amino]-2-methylpropanoate

tert-butyl 3-{[(4-fluorophenyl)methyl]amino}-2-methylpropanoate

tert-butyl 2-methyl-3-[(4-phenylbutan-2-yl)amino]propanoate

methyl 2-methyl-3-[(pentan-3-yl)amino]propanoate

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

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