ethyl 3-[(butan-2-yl)amino]propanoate

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

methyl 3-{[5-(diethylamino)pentan-2-yl]amino}-2-methylpropanoate

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