Indeed, in the last five years, piperazine derivatives such as BZP and CPP, synthetic cannabinoids including «spice» and now synthetic cathinones including mephedrone have come along in quick succession. (newscientist.com)
The introduction of a conformationally constrained piperazine in compound 64 caused a further increase in potency. (thno.org)
Remarkable anti-HIV activities were observed with the C - 4 linked propylamine derivatives 65 - 68 as well as the compounds in which the basic amine was incorporated into a heterocycle, such as piperazine (compounds 69 - 71). (thno.org)