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

3-{[(tert-butoxy)carbonyl][(4-methoxyphenyl)methyl]amino}propanoic acid

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

tert-butyl 3-(propylamino)propanoate

tert-Butyl 3-(ethylamino)propanoate

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

tert-butyl 3-{[(4-chlorophenyl)methyl]amino}propanoate

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

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

ethyl 3-[(2,2-dimethoxyethyl)amino]propanoate

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