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

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

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

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

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

methyl 3-{[(furan-2-yl)methyl]amino}butanoate

methyl 3-[(2-phenylethyl)amino]butanoate

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

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

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

methyl 3-[(2,2-dimethoxyethyl)amino]butanoate