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J Med Chem. 1995 Jun 23;38(13):2326-30.

The serotonin 5-HT4 receptor. 1. Design of a new class of agonists and receptor map of the agonist recognition site.

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  • 1Sandoz Pharma Limited, Basel, Switzerland.


The design and synthesis of a new class of potent and selective 5-HT4 receptor agonists containing an indole nucleus linked to a carbazimidamide are presented. A conformational study of the 5-HT4 receptor agonists serotonin and zacopride led to the identification of an initial pharmacophore and to the definition of a three-dimensional map of the 5-HT4 agonist recognition site. 1, a representative member of our new class of 5-HT4 receptor agonists, incorporates all reference structural features and matched perfectly with these models. 1 is a highly potent, full agonist at 5-HT4 receptors present in the isolated electrically stimulated guinea pig ileum preparation, with a pD2 value of 8.8, displaying selectivity (ranging from 40- to over 10,000-fold) versus other members of the serotonin receptor family.

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