[{"from": "human", "value": "Could you provide a description of this molecule? [C][N][C][C][N][C][Branch1][Ring2][C][Ring1][=Branch1][C][=C][C][=C][C][=C][Ring1][=Branch1][C][C][=C][Ring1][N][N][=C][C][=C][Ring1][=Branch1]"}, {"from": "gpt", "value": "The molecule is an antidepressant introduced by Organon International in 1996 used for the treatment of moderate to severe depression. Mirtazapine has a tetracyclic chemical structure and is classified as a noradrenergic and specific serotonergic antidepressant (NaSSA). It is the only tetracyclic antidepressant that has been approved by the Food and Drug Administration to treat depression."}]