(S)-α-tert-butoxycarbonylamino-γ-(2-methylsulfonylpyrimidin-4-yl)butyric acid α-tert-butyl ester

(S)-α-tert-butoxycarbonylamino-γ-(2-amino-6-propylpyrimidin-4-yl)butyric acid α-tert-butyl ester

(S)-α-tert-butoxycarbonylamino-γ-(2-methylthio-6-phenylpyrimidin-4-yl)butyric acid α-tert-butyl ester

(S)-2-tert-butoxycarbonylamino-5-oxodeca-6-ynoic acid tert-butyl ester

N-tert-butoxycarbonyl-L-glutamic acid α-tert-butyl ester γ-N-methoxy-N-methylamide