J 104129 is a potent mAChR M3 antagonist that displays ~ 120-fold selectivity over mAChR M2 (Ki values are 4.2, 19 and 490 nM for human mAChR M3, mAChR M1 and mAChR M2 receptors, respectively). J 104129 exhibits > 250-fold bronchial selectivity. It inhibits ACh-induced bronchoconstriction but not ACh-induced bradycardia (KB values are 3.3 and 170 nM for rat trachea mAChR M3 and rat right atria mAChR M2 receptors, respectively).
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