(2S)-2-azaniumyl-4-[(R)-methylsulfinyl]butanoate (2S)-2-ammonio-4-[(R)-methylsulfinyl]butanoate (2S)-2-ammonio-4-[(R)-methylsulfinyl]butyrate ZINC01529567 (2S)-2-amino-4-[(R)-methylsulfinyl]butanoic acid (2S)-2-amino-4-[(R)-methylsulfinyl]butyric acid L-Methionine (R)-S-oxide