Substituted tropanes
Tropane alkaloids are a class of chemicals that include compounds with psychoactive effects.

Chemistry
Tropane alkaloids are molecules that contain a tropane ring in their structure.
Pharmacology
Tropane alkaloids are mostly anti-cholinergics (antagonistic action on acetylcholine receptors) or stimulants (prevention of dopamine reuptake).
Examples
Tropane alkaloids are seen throughout organic chemistry, including psychoactive and anaesthetic compounds.
Anticholinergic Drugs
Stimulant Drugs