(2S)-2-amino-4-[(2R)-2-amino-3-hydroxy-3-oxopropyl]selanylbutanoic acid (2S)-2-amino-4-[(2R)-2-amino-3-hydroxy-3-oxo-propyl]selanyl-butanoic acid (2S)-2-amino-4-[[(2R)-2-amino-3-hydroxy-3-oxopropyl]seleno]butanoic acid (2S)-2-amino-4-[[(2R)-2-amino-3-hydroxy-3-keto-propyl]seleno]butyric acid C08297 L-Selenocystathionine