The compound was prepared by solid-phase peptide synthesis on a poliethylene glycol amino resin. Coupling with N(alpha)-Fmoc-N(G)-Boc-lysine (I) using O-benzotriazol-1-yl-N,N,N',N'-tetramethyluronium hexafluorophosphate (HBTU) and N-methylmorpholine (NMM) afforded the protected lysine-linked resin (II), and subsequent Fmoc deprotection provided resin (III). This was submitted to further coupling and deprotection cycles with the N(alpha)-Fmoc-protected amino acids proline (IV), N(G)-(2,2,4,6,7-pentamethyldihydrobenzofuran-5-sulfonyl)arginine (VI), D-alanine (VIII), N(G)-Pbf-arginine (VI), and again N(G)-Pbf-arginine (VI) yielding peptide resins (V), (VII), (IX), (X) and (XI).

The coupling and deprotection cycles were continued with leucine (XII), N(in)-Boc-tryptophan (XIV), and again N(in)-Boc-tryptophan (XIV) affording peptide resins (XIII), (XV) and (XVI).

Further coupling and deprotection cycles with N(epsilon)-Boc-lysine (I), and O-tert-butyl-tyrosine (XVIII), yielded the peptide resins (XVII) and (XIX), respectively. Then, acetylation of the free amino group of peptide resin (XIX) with Ac2O, and final deprotection and cleavage from the resin by means of moist trifluoroacetic acid, phenol and triisopropylsilane furnished the title peptide amide.