Download full text in PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... Novel 2-benzyl-4-aminopiperidines have been shown to be potent and selective antagonists at the NK 1 receptor. Some compounds of this series, eg CGP 49823 (2), show CNS activity after oral administration. ... Novel 2-benzyl-4-aminopiperidines have been shown to be potent ...