3-{[(2H-1,3-benzodioxol-5-yl)methyl][(tert-butoxy)carbonyl]amino}propanoic acid

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

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

tert-butyl 3-(hexylamino)propanoate

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

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

tert-butyl 3-{[2-(1H-indol-3-yl)ethyl]amino}propanoate

tert-butyl 3-(cycloheptylamino)propanoate

Ethyl 3-(propylamino)propanoate

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

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