3-{[(tert-butoxy)carbonyl](2,2-diethoxyethyl)amino}propanoic acid

tert-butyl 3-{[2-(2,4-dichlorophenyl)ethyl]amino}propanoate

tert-butyl 3-{[(4-methoxyphenyl)methyl]amino}propanoate

tert-butyl 3-[(2-methylcyclohexyl)amino]propanoate

ethyl 3-[(butan-2-yl)amino]propanoate

ethyl 3-{[(pyridin-2-yl)methyl]amino}propanoate

ethyl 3-{[(oxolan-2-yl)methyl]amino}propanoate

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

ethyl 3-{[3-(dimethylamino)-2,2-dimethylpropyl]amino}propanoate

tert-butyl 2-methyl-3-[(2-phenylethyl)amino]propanoate

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