IDO1-IN-25 is a dual inhibitor of IDO1/TDO2 , with IC 50 values of 0.17 μM and 3.2 μM, respectively. IDO1-IN-25 can effectively inhibit the production of NO in RAW264.7 cells stimulated by lipopolysaccharide (LPS). IDO1-IN-25 can exert anti-inflammatory effects in a mouse ear edema acute inflammation model induced by croton oil.