Novel purine derivatives of the formula: ##STR1## wherein R.sup.1 is hydrogen or alkyl of 1 to 3 carbon atoms, R.sup.2 is alkyl of 1 to 3 carbon atoms or allyl, and R.sup.3 and R.sup.4, respectively, mean halogen, and their acid addition salts are provided. These compounds have anticoccidial activity and are useful for treating caecal and/or intestinal coccidiosis in poultry and domestic animals.
Compounds of formula I:
wherein R1 to R5 are defined herein, for use in modulating an immune response in a subject, wherein said use comprises administering said compound to said subject, are disclosed.
式 I 的化合物:
其中 R1 至 R5 在本文中定义,用于调节受试者的免疫反应,其中所述用途包括向所述受试者施用所述化合物。