Abstract

Since its discovery by von Euler 60 years ago, substance P has exercised the minds of pharmacologists and become of great interest for drug discovery. Because the peptide is a transmitter in pain endings in the spinal cord, pharmaceutical companies searching for novel analgesics have tried to synthesise specific and selective antagonists for the substance-P receptor, also known as the neurokinin 1 (NK1) receptor. Since the first report on such a compound in 19911 several substance-P antagonists have been synthesised, but none has been effective in reducing pain.

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