Garret et al (1991) Pharmacological properties of a potent and selective nonpeptide substance P antagonist. Proc.Natl.Acad.Sci.USA 88 10208. Fong et al (1992) Molecular basis for the species selectivity of the neurokinin-1 receptor antagonists CP-96,345 and RP67580. J.Biol.Chem. 267 25668. Beaujouan et al (1993) Higher potency of RP 67580, in the mouse and the rat compared with other nonpeptide and peptide tachykinin NK1 antagonists. Br.J.Pharmacol. 108 793. Rupniak et al (1993) Antinociceptive activity of NK1 receptor antagonists: non-specific effects of racemic RP67580. Br.J.Pharmacol. 110 1607.