(S)-2-[(S)-2-Amino-5-(3-fluoro-phenyl)-pent-4-ynoylamino]-4-methyl-pentanoic acid methyl ester

(S)-2-[(Dimethoxy-phosphorylmethyl)-amino]-5-(2-fluoro-phenyl)-pent-4-ynoic acid

[(S)-1-(2-Cyano-ethylcarbamoyl)-4-(2-fluoro-phenyl)-but-3-ynyl]-carbamic acid tert-butyl ester

(S)-2-[(S)-2-tert-Butoxycarbonylamino-5-(2-chloro-phenyl)-pent-4-ynoylamino]-4-methyl-pentanoic acid methyl ester