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  1. Fentanyl | C22H28N2O | CID 3345 - PubChem

  2. Fentanyl - Wikipedia

  3. Fentanyl | C22H28N2O - ChemSpider

  4. Fentanyl - NIST Chemistry WebBook

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

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

  7. Fentanyl and Its Derivatives, Pharmacology, Use and Abuse, and ...

  8. 3D structure for Fentanyl (DB00813) | DrugBank Online

  9. Fentanyl drug profile | www.euda.europa.eu