Studies in analgesia; piperidine derivatives with morphine-like activity.
D000698:Analgesia; D009020:Morphine; D009022:Morphine Derivatives; D010146:Pain; D010880:Piperidines
D009022:Morphine Derivatives; D010880:Piperidines; D009020:Morphine
PIPERIDINE/morphine-like activity