L-ALPHA-GLUTAMYL-L-VALINE L-A-GLUTAMYL-L-VALINE 4-amino-5-[(1-carboxy-2-methyl-propyl)amino]-5-keto-valeric acid 4-amino-5-[(1-hydroxy-3-methyl-1-oxobutan-2-yl)amino]-5-oxopentanoic acid 4-azanyl-5-[(1-hydroxy-3-methyl-1-oxo-butan-2-yl)amino]-5-oxo-pentanoic acid alpha-Glu-Val H-GLU-VAL-OH GLU-VAL