Pyridine derivatives of the general formula
 wherein:
   X is a divalent radical of:
 are PAF antagonists. Processes for their preparation and pharmaceutical compositions containing them are also included.
                            通式如下的
吡啶衍生物
 其中
X 是下列物质的二价基
 是 PAF 拮抗剂。它们的制备方法和含有它们的药物组合物也包括在内。