Substance P (SP) is an undecapeptide neurotransmitter and is implicated in several important disease states, particularly in pain and inflammation.'P2 However, the therapeutic significance of a SP antagonist has not been fuuy explored, primarily due to the lack of orally available, nonpeptide SP antagonists except for the recently disclosed nonpeptidic quinuclidines. 3 During ongoing efforts to discover novel, nonpeptide SP antagonists, we ...