Ivosidenib-13C5 (AG-120-13C5) is 13C labeled Ivosidenib. Ivosidenib (AG-120) is an orally active inhibitor of isocitrate dehydrogenase 1 mutant (mIDH1) enzyme, it exhibits profound d-2-hydroxyglutatrate (2-HG) lowering in vivo. Ivosidenib (AG-120) has the potential for AML therapy due to its acceptable safety profile and clinical activity[1].