M8891 is an orally active, reversible and brain penetrant Methionine Aminopeptidase-2 (MetAP-2) inhibitor with an IC50 of 54 nM and a Ki of 4.33 nM. M8891 does not inhibit MetAP-1 (IC50>10 µM). M8891 inhibits growth of primary endothelial cells as well as tumor cells and demonstrates antiangiogenic and antitumoral activity.
