* http://www.whocc.no/atc_ddd_index/
*N Nervous system
** N01 Anesthetics
** N02 Analgesics
** N03 Antiepileptics
** N04 Anti-Parkinson drugs
** N05 Psycholeptics
*** N05A Antipsychotics
**** N05AA Phenothiazines with aliphatic side-chain
**** N05AB Phenothiazines with piperazine structure
**** N05AC Phenothiazines with piperidine structure
**** N05AD Butyrophenone derivatives
**** N05AE Indole derivatives
**** N05AF Thioxanthene derivatives
**** N05AG Diphenylbutylpiperidine derivatives
**** N05AH Diazepines, oxazepines, thiazepines and oxepines
**** N05AL Benzamides
**** N05AN Lithium
**** N05AX Other antipsychotics
*** N05B Anxiolytics
*** N05C Hypnotics and sedatives
** N06 Psychoanaleptics
*** N06A Antidepressants
*** N06B Psychostimulants, Agents for ADHD and nootropics
*** N06C Psycholeptics and Psychoanaleptics in combination
*** N06D Anti dementia drugs
** N07 Other nervous system drugs