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

3-{[(tert-butoxy)carbonyl][3-(propan-2-yloxy)propyl]amino}propanoic acid

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

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

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

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

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

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

ethyl 3-{[(4-fluorophenyl)methyl]amino}propanoate

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

ethyl 3-{[(4-methylphenyl)methyl]amino}propanoate