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

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

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

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

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

tert-butyl 3-(octylamino)propanoate

ethyl 3-{[3-(morpholin-4-yl)propyl]amino}propanoate

ethyl 3-(cyclopropylamino)propanoate

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

ethyl 3-(tert-butylamino)propanoate

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