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

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

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

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

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

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

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

tert-butyl 3-(tert-butylamino)propanoate

tert-butyl 3-(cyclooctylamino)propanoate

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

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