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

tert-butyl 3-{[3-(dimethylamino)-2,2-dimethylpropyl]amino}propanoate

ethyl 3-[(1-phenylethyl)amino]propanoate

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

ethyl 3-[(diphenylmethyl)amino]propanoate

ethyl 3-(octylamino)propanoate

tert-butyl 3-{[(furan-2-yl)methyl]amino}-2-methylpropanoate

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

tert-butyl 3-{[(2H-1,3-benzodioxol-5-yl)methyl]amino}-2-methylpropanoate

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

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