We report here the synthesis and preliminary pharmacological character
ization of a novel Neurokinin A receptor antagonist. This molecule con
tains a dehydroalanine residue. It displays a high conformational rigi
dity and possesses very high activity. Its pharmacological properties
as a neurokinin A receptor antagonist were assessed in in vitro experi
ments on rat vas deferens and were compared to those of Neuronorm and
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