3-{[(tert-butoxy)carbonyl](diphenylmethyl)amino}propanoic acid

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

ethyl 3-[(pentan-3-yl)amino]propanoate

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

ethyl 3-[(1-phenylethyl)amino]propanoate

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

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

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

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

ethyl 3-[(2-methylcyclohexyl)amino]propanoate

tert-butyl 3-{[3-(propan-2-yloxy)propyl]amino}propanoate