<unk>  has a tetracyclic structure and is a close analogue of mianserin and mirtazapine, with<unk>  being delta(13b,4a),4a-carba-mianserin, and mirtazapine being 6-azamianserin.
Setiptiline
Verapamil
Tocainide
Procainamide
Ivabradine
Veratridine
Flecainide
Lofexidine