Columbia subject headings:
Analgesics--Analysis.
Drugs--Structure-activity relationships.
Hallucinogenic drugs--Analysis.
Narcotic antagonists--Analysis.
Harvard subject headings:
Analgesics--Analysis.
Drugs--Structure-activity relationships
Hallucinogenic drugs--Analysis.
Narcotic antagonists--Analysis.
Princeton subject headings:
Analgesics--Analysis.
Drugs--Structure-activity relationships.
Hallucinogenic drugs--Analysis.
Narcotic antagonists--Analysis.