(R)-2-(((R)-carboxy(phenyl)methyl)amino)-3-methylbutanoic acid

(R)-2-[(2-hydroxy-1-phenylethyl)amino]-3-methylbutanenitrile

(R)-3-methyl-2-((S)-3-phenyl-2H-1,4-oxazin-4(3H)-yl)butanenitrile

(S)-2-(N-((R)-1-cyano-2-methylpropyl)formamido)-2-phenylethyl formate