Ensaculin free base (KA-672) is a NMDA antagonist and have high affinities to serotonergic 5-HT1A and 5-HT7 receptors, adrenergic alpha1, and dopaminergic D2 and D3 receptors. Ensaculin free base is a memory-enhancing agent. Ensaculin free base has the potential as an antidementia agent acting on various transmitter systems[1].