ST1936 is a potent serotonin 6 (5-HT6) receptor agonist with activity in animal pharmacological models for central nervous system disorders: effect of ST 1936 was investigated on depression-like experimental models. In addition, ST 1936 displays moderate affinity for human α2 adrenergic receptors, shown to increase Ca2+ concentration and phosphorylation of Fyn kinase, and regulate the activation of ERK1/2 in cloned cells.