Methyl (2R)-3-benzyloxycarbonylamino-2-(tert-butyloxycarbonylamino)-2-methylpropanoate
(R)-2-Amino-3-benzyloxycarbonylamino-2-methyl-propionic acid methyl ester
((2R,5S)-5-Isopropyl-3,6-dimethoxy-2-methyl-2,5-dihydro-pyrazin-2-ylmethyl)-carbamic acid benzyl ester
Methyl (2S)-3-benzyloxycarbonylamino-2-(tert-butyloxycarbonylamino)-2-methylpropanoate
(S)-2-Amino-3-benzyloxycarbonylamino-2-methyl-propionic acid methyl ester