Which of the following cyclic molecules is a meso compound? 
Definitions:
Norepinephrine
A neurotransmitter involved in arousal and alertness, as well as in the stress response.
Positive Symptoms
Features of psychotic conditions characterized by the presence of unusual perceptions, thoughts, or behaviors not normally experienced by individuals.
Delusion
A false belief, often of persecution or grandeur, that may accompany psychotic disorders.
Hallucination
A perception of seeing, hearing, or feeling something that is not present in reality.
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