3-{[(tert-butoxy)carbonyl][2-(1H-indol-3-yl)ethyl]amino}propanoic acid

tert-butyl 3-[(3-methoxypropyl)amino]propanoate

tert-butyl 3-[(prop-2-en-1-yl)amino]propanoate

tert-butyl 3-(cyclopentylamino)propanoate

ethyl 3-(butylamino)propanoate

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

ethyl 3-{[(2H-1,3-benzodioxol-5-yl)methyl]amino}propanoate

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

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

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

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