fentanyl, fentanil, c22h28n2o molecule. it is opioid analgesic. structural chemical formula

anaesthetic analgesia analgesic atom atomic c22h28n2o carbon care chemical chemistry chronic compound drug fentanil fentanyl fentanyle formula hydrogen illustration lollipop molecular molecule narcotic nitrogen opioid organic overdose pain palliative recreational schematic structural structure transdermal vector