(2S)-5-amino-2-[[(2S,3R)-2-azaniumyl-3-hydroxybutanoyl]amino]-5-oxopentanoate (2S)-5-amino-2-[[(2S,3R)-2-azaniumyl-3-hydroxy-butanoyl]amino]-5-oxo-pentanoate (2S)-5-amino-2-[[(2S,3R)-2-ammonio-3-hydroxy-1-oxobutyl]amino]-5-oxopentanoate (2S)-5-amino-2-[[(2S,3R)-2-ammonio-3-hydroxy-butanoyl]amino]-5-keto-valerate ZINC02522621