Na-Boc-D-glutamine Merrifield resin

Boc-D-phenylalanine Merrifield resin

Na-Boc-L-tryptophan Merrifield resin

Boc-O-benzyl-L-threonine Merrifield resin

L-Aspartic acid b-benzyl ester a-amide hydrochloride

Trityl alcohol resin

L-Arg-Pro-pNA

L-Glutamine-2-chlorotrityl resin

O-tert-Butyl-L-threonine 2-chlorotrityl resin

L-Proline-2-chlorotrityl resin