Mutant IDH1 inhibitor 2 is a inhibitor of mutant Isocitrate dehydrogenase (IDH) proteins, with IC50 of in LS-MS biochemical assay, IC50 of 16.6 nM in Fluorescence biochemical assay. Target: Mutant IDH1 Mutant IDH1 inhibitor 2 has a neomorphic activity and in the treatment of diseases or disorders associated with such mutant IDH proteins including, but not limited to, cell-proliferation disorders, such as cancer. More bioactivity information in Patent WO 2013046136A1 (Example 224).