3-Aminochromans

Alnespirone (S-20,499) is a selective 5-HT1A receptor full agonist of the azapirone chemical class. It produces antidepressant, anxiolytic, and antiaggressive effects.

Robalzotan (, ; developmental code names NAD-299, AZD-7371) is a selective antagonist at the serotonin 5-HT1A receptor which was under development for the treatment of major depressive disorder, anxiety disorders, gastrointestinal disorders, irritable bowel syndrome (IBS), and overactive bladder.