Pro-Trp-OH

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

Z-DL-leucine amide

DL-norleucine amide

Fmoc-L-valine Rink amide AM resin

Fmoc-N-ethyl-hydroxylamine