(E)-methyl 3-(tert-butoxycarbonylamino)-2-methylacrylate
(Z)-methyl 3-(tert-butoxycarbonylamino)-2-methylacrylate
methyl (S)-3-(tert-butoxycarbonylamino)-2-methylpropanoate
(R)-methyl 3-{[(tert-butoxy)carbonyl]amino}-2-methylpropionate
methyl 2-{[(tert-butoxycarbonyl)amino]methyl}acrylate