{2-[benzyl(3-bromo-2-bromomethylpropionyl)amino]-4-methylpentanoylamino}acetic acid benzyl ester

benzyl N-benzyl-N-(3-(tosyloxy)-2-((tosyloxy)methyl)propanoyl)leucylglycinate

{2-[benzyl(3-methanesulfonyloxy-2-methanesulfonyloxymethylpropionyl)amino]-4-methylpentanoylamino}acetic acid benzyl ester

{2-[benzyl(3-iodo-2-iodomethylpropionyl)amino]-4-methylpentanoylamino}acetic acid benzyl ester

(2-{benzyl[2-(toluene-4-sulfonyloxymethyl)acryloyl]amino}-4-methylpentanoylamino)acetic acid benzyl ester