A method of regulating the immune system of a mammal, which comprises administering to said mammal an immuno-regulatory agent, wherein said agent is selected from the group consisting of compounds of the formula (I): ##STR1## (wherein R represents hydrogen or a C.sub.1 -C.sub.3 alkyl group) and pharmaceutically acceptable salts and esters thereof.
一种调节哺乳动物免疫系统的方法,包括向该哺乳动物给予免疫调节剂,所述剂选择自公式(I)的化合物组,其中: ##
STR1## (其中R代表
氢或C.sub.1-C.sub.3烷基),以及其药学上可接受的盐和
酯。