(2S)-2-amino-5-(2-cyanoethylamino)-5-oxopentanoic acid (2S)-2-amino-5-(2-cyanoethylamino)-5-oxo-pentanoic acid (2S)-2-amino-5-(2-cyanoethylamino)-5-keto-valeric acid gamma-Glutamyl-3-aminopropiononitrile gamma-Glutamyl-beta-aminopropiononitrile C06114