Glutathione-diethyl ester (reduced)

Pro-Gly-OH

N-Methyl-L-valine benzyl ester 4-toluenesulfonate salt

Tosyl-D-proline

Ne-Biotinyl-L-lysine amide

Cyclo(-L-Ser-L-Tyr)

Cyclo(-Phe-Pro)

(R)-3-(Boc-amino)-2-oxo-1-pyrrolidine-acetic acid

Acetyl-O-methyl-L-tyrosine

Benzoyl-L-norleucine

Phthaloyl-glycine 4-nitorophenyl ester