Cyclanoline is an

acetylcholinesterase inhibitor Acetylcholinesterase inhibitors (AChEIs) also often called cholinesterase inhibitors, inhibit the enzyme acetylcholinesterase from breaking down the neurotransmitter acetylcholine into choline and acetate, thereby increasing both the level an ...

isolated from ''Stephania venosa tuber''.

References

Acetylcholinesterase inhibitors {{organic-compound-stub