CHEMBL5729947

Inhibition Assay: A partial protein of only a kinase domain of FLT3 protein was purchased from Carna Biosciences Inc., Japan, and tests were conducted as in Test Example 5. Test Example 5: A partial protein of only a kinase domain of RET protein was purchased from Carna Biosciences Inc., Japan. The phosphorylation activity toward a peptide substrate was investigated using an EZ reader (Caliper). Test compounds were each mixed with a protein solution to give 8 final concentrations from 100 nM to 0.03 nM, followed by addition of a mixed liquid of ATP and substrate peptide (Caliper) and reaction for 30 minutes. The ATP concentration used was 100 µM. A reaction liquid which contained protein but no test compound (in which the solvent DMSO alone was added at 0.8% in place of the test compound) was prepared, followed by reaction in the same manner with or without ATP addition.