N-CARBOBENZOXY-L-LEUCYL-L-LEUCINE Z-LEU-LEU-OH Z-L-LEUCYL-L-LEUCINE CBZ-L-LEU-L-LEU N-[N-(benzyloxycarbonyl)-L-leucyl]-L-leucine Cbz-L-Leu-L-Leu-OH Z-L-Leu-L-Leu-OH (S)-2-((S)-2-(((Benzyloxy)carbonyl)aMino)-4-MethylpentanaMido)-4-Methylpentanoic acid