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Sharma SK, Jones RM, Metzger TG, Ferguson DM, Portoghese PS. Transformation of a kappa-opioid receptor antagonist to a kappa-agonist by transfer of a guanidinium group from the 5'- to 6'-position of naltrindole. J Med Chem. 2001 Jun 21;44(13):2073–9. doi: 10.1021/jm010095v. PMID: 11405645. |