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. Author manuscript; available in PMC: 2016 Mar 6.
Published in final edited form as: Eur J Med Chem. 2014 Dec 19;92:64–77. doi: 10.1016/j.ejmech.2014.12.033

Scheme 1.

Scheme 1

Solid phase assembly of the constrained opioid tetrapeptide and solution phase coupling of NK1R pharmacophoric benzyl group