tert-butyl 3-{[2-(1H-indol-3-yl)ethyl]amino}propanoate

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

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

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

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

ethyl 3-{[3-(propan-2-yloxy)propyl]amino}propanoate

tert-butyl 2-methyl-3-{[2-(morpholin-4-yl)ethyl]amino}propanoate

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

tert-butyl 3-{[3-(1H-imidazol-1-yl)propyl]amino}-2-methylpropanoate

tert-butyl 3-(cyclooctylamino)-2-methylpropanoate

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