2-(2-amino-4-(methylthio)butanamido)-4-(methylthio)butanoicacid; N-DL-Methionyl-DL-methionine; (S)-2-((S)-2-Amino-4-(methylthio)butanamido)-4-(methylthio)butanoic acid; 2-[(2-amino-4-methylsulfanyl-butanoyl)amino]-4-methylsulfanyl-butanoic acid; D-Methionine, N-L-methionyl-
