the s molecular structure of fentanyl

chemical structure chemistry molecular molecule fentanyl opioid medicine medical formula element model fentanil biochemistry scientific pharmacy atom research narcotic atomic analgesic fentanyle anesthesia healthy compound line icon analgesia carfentanil structural organic symbol isolated fentanile drawing blue phentanyl fentora c22h28n2o png synthetic lipophilic phenylpiperidine agonist anesthetic properties