(2S)-2-[[(2S,3R)-2-azaniumyl-3-hydroxybutanoyl]amino]-4-methylpentanoate (2S)-2-[[(2S,3R)-2-azaniumyl-3-hydroxy-butanoyl]amino]-4-methyl-pentanoate (2S)-2-[[(2S,3R)-2-ammonio-3-hydroxy-1-oxobutyl]amino]-4-methylpentanoate (2S)-2-[[(2S,3R)-2-ammonio-3-hydroxy-butanoyl]amino]-4-methyl-valerate ZINC02575129