5JR2:
reference: Modifications of a Nanomolar Cyclic Peptide Antagonist for the EphA4 Receptor To Achieve High Plasma Stability., Olson EJ, Lechtenberg BC, Zhao C, Rubio de la Torre E, Lamberto I, Riedl SJ, Dawson PE, Pasquale EB, ACS Med Chem Lett. 2016 Jun 25;7(9):841-6. doi: 10.1021/acsmedchemlett.6b00132., eCollection 2016 Sep 8. PMID: 27660688

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