There are disclosed a y-butyrolactone derivative represented by the following formula
wherein R1, R2, R3 and X each represent a group or an atom as defined in the specification;
a process for preparing the same: and an immunomodulating composition containing the same as an active ingredient.
本发明公开了由下式表示的 y
-丁内酯衍
生物,其中 R1、R2、R3 和 X 各自代表本说明书中定义的基团或原子;本发明的制备方法;以及含有本发明作为活性成分的免疫调节组合物。