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

tert-butyl 3-[(4-phenylbutan-2-yl)amino]propanoate

tert-butyl 3-(octylamino)propanoate

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

ethyl 3-(cyclopropylamino)propanoate

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

ethyl 3-(tert-butylamino)propanoate

tert-butyl 2-methyl-3-[(pentan-3-yl)amino]propanoate

tert-butyl 2-methyl-3-(propylamino)propanoate

tert-butyl 3-[(3-methoxypropyl)amino]-2-methylpropanoate

tert-butyl 3-{[3-(dimethylamino)propyl]amino}-2-methylpropanoate