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

tert-butyl 3-(cyclohexylamino)propanoate

tert-butyl 3-(propylamino)propanoate

tert-butyl 3-(pentylamino)propanoate

tert-butyl 3-[(2,2-dimethoxyethyl)amino]propanoate

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

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

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

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

ethyl 3-(butylamino)propanoate

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