We synthesized a series of novel 3-phenyl-4-benzylaminopiperidine derivatives that were identified as potent tachykinin NK1 receptor antagonists by structural modification of the 3- benzhydrylpiperidone derivative through high-throughput screening. N-{2-[(3R, 4S)-4-({2- Methoxy-5-[5-(trifluoromethyl)-1H-tetrazol-1-yl] benzyl} amino)-3-phenyl-1-piperidinyl]-2- oxoethyl} acetamide ((+)-39) was found to be one of the most potent tachykinin NK1 ...