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pubmed-article:2551304pubmed:abstractTextThe effects of new 4-aminopyridine (4-AP) derivatives were investigated in the isolated mouse phrenic nerve-hemidiaphragm preparation under single impulse stimulation and tetanic conditions. The basic 4-AP structure was modified in position 3 on the pyridine nucleus by introducing different substituents. Results were compared to those obtained with 4-AP and 3,4-diaminopyridine. The compounds were tested for their antagonistic effect against calcium antagonists and botulinum toxin A. The effect on smooth muscle was investigated on the isolated guinea-pig ileum. Physico-chemical parameters of the test compounds were determined by the partition coefficient and ionization constant. Finally structure-activity relationship analysis revealed that the activity was highly related to lipophilicity and the steric volume. So far 4-AP itself provided the most advantageous molecular structure.lld:pubmed
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pubmed-article:2551304pubmed:articleTitleEffects of new 4-aminopyridine derivatives on neuromuscular transmission and on smooth muscle contractility.lld:pubmed
pubmed-article:2551304pubmed:affiliationInstitute of Pharmacology, University of Zurich, Switzerland.lld:pubmed
pubmed-article:2551304pubmed:publicationTypeJournal Articlelld:pubmed
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