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  1. Fentanyl - Wikipedia

  2. Fentanyl | C22H28N2O | CID 3345 - PubChem

  3. Fentanyl - NIST Chemistry WebBook

  4. Fentanyl | C22H28N2O - ChemSpider

  5. Fentanyl-related compounds and derivatives: current status …

  6. Fentanyl Structure as a Scaffold for Opioid/Non-Opioid …

  7. Fentanyl - NIST Chemistry WebBook

  8. Structure–Activity Relationships of the Fentanyl Scaffold ...

  9. 3D structure for Fentanyl (DB00813) | DrugBank Online

  10. Fentanyl | Chem 13 News Magazine | University of Waterloo