| abstract |
(57) [Summary] (With correction) [Problem] To provide a novel CD40 signal blocker. SOLUTION: A CD40 signal blocker comprising an s-triazolo [1,5-a] pyrimidine derivative represented by the following formula (I) or a pharmaceutically acceptable salt thereof as an active ingredient. R 1 : hydrogen, halogen, C 1-4 alkyl, N-alkyl group, etc. R 2 : hydrogen, halogen, C 1-4 alkyl, alkenyl group, etc. R 3 : amino group, substituted amino group, aryl group, heterocyclic group R 4 : hydrogen, halogen, C 1-4 alkyl, aryl group, etc. |