4-tert-Butyloxycarbonyl-L-phenylalanine

Trityl-1,4-diaminobutane acetate

Boc-3,4-difluoro-DL-phenylalanine

S-Benzyl-D-penicillamine

Boc-D-propraglycine dicyclohexylammonium salt

Ac-Phe-Tyr-NH2

Cyclo(L-His-L-Pro)

Glutathione-diethyl ester (reduced)

D-Val-D-Val-OH

Gly-Phe-pNA

Gly-Gly-His-OH