(S)-Mianserin.<unk>  is a tetracyclic piperazinoazepine; mirtazapine was developed by the same team of organic chemists and differs via addition of a nitrogen atom in one of the rings. (S)-(+)-Mianserin is approximately 200–300 times more active than its enantiomer (R)-(−)-mianserin; hence, the activity of<unk>  lies in the (S)-(+) isomer.
Mianserin
Ketanserin
Nabilone
Triptan
Seltorexant
Sumatriptan
Naratriptan
Zolmitriptan