trans-3,4-Dimethyl-4-(3-carboxamidophenyl)piperidines constitute a novel class of p opioid receptor antagonists. The CONH, group was found to be an effective isostere of the phenolic OH moiety. Structure-activity relationships at the piperidine nitrogen position led to the identification of several ligands displaying high affinity toward the cloned human P opioid receptors, good selectivity mu/delta, mu/kappa, and potent in vitro antagonist activity. (C) 2003 Elsevier Ltd. All rights reserved.
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