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

tert-butyl 3-[(pentan-3-yl)amino]propanoate

tert-butyl 3-(cyclohexylamino)propanoate

tert-butyl 3-[(1-phenylethyl)amino]propanoate

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

tert-butyl 3-{[5-(diethylamino)pentan-2-yl]amino}propanoate

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

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

ethyl 3-{[2-(piperidin-1-yl)ethyl]amino}propanoate

ethyl 3-(pentylamino)propanoate

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