| abstract |
Novel 1,4-disubstituted piperazine compounds represented by the formula (I): ##STR1## wherein A is a condensed polycyclic hydrocarbon group; n R is a phenyl group substituted with a lower alkoxy group; n X is methylene group, carbonyl group or thiocarbonyl group; n and m is 2 or 3, and their salts n are useful as a platelet activating factor antagonist. |