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Tetrahydropapaveroline (norlaudanosoline) is a benzyltetrahydroisoquinoline alkaloid.
It can be formed in trace amounts in the brain by a condensation reaction of dopamine and dopaldehyde (a metabolite of dopamine).
It inhibits dopamine uptake within the cerebral cortex.
References
Tetrahydropapaveroline Wikipedia(Text) CC BY-SA