![](http://www.alamy.com/thumbs/6/693DDB9E-B49D-44DC-9624-C40CBBC03EDF/2JCRP48.jpg)
3D image of Cyclazocine skeletal formula - molecular chemical structure of opioid agonist-antagonist isolated on white background
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Photo credit: © Kseniya-Omega / Alamy / Afripics
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