Novel 1,4-disubstituted piperazine compounds represented by the formula (I):
 wherein A is a condensed polycyclic hydrocarbon group;
    R is a phenyl group substituted with a lower alkoxy group;
    X is methylene group, carbonyl group or thiocarbonyl group;
    and m is 2 or 3, and their salts
are useful as a platelet activating factor antagonist.  
                            由式(I)代表的新型1,4-二取代
哌嗪化合物:
 其中 A 是缩合多
环烃基团
R 是被低级烷氧基取代的苯基
X 是亚甲基、羰基或
硫代羰基;
m 为 2 或 3,以及它们的盐类
可用作血小板活化因子拮抗剂。