As a continuation of our work on N-[4-aryl(heteroaryl)piperazin-1-ylalkyl]-
3,4-pyrroledicarboximides, which were characterized by strong analgesic act
ivity and CNS depressive action, several novel N-substituted 3,4-pyrroledic
arboximides were prepared and eleven representatives were examined in a ser
ies of in vivo CNS tests, A few of these compounds displayed a similar prof
ile of biological selectivity to that of 3,4-pyrroledicarboximides describe
d previously; their structure-activity relationships are discussed.