3d image of alfentanil skeletal formula

alfentanil r-39209 short-acting synthetic opioid analgesic drug anaesthesia surgery opioid receptors cardiovascular respiratory depression nerve blocks sedation sedative calming anesthesia muscle relaxation analgesia pain relief anesthetic medication side effect adverse action iatrogenic overdose contraindications interaction pharmacology pharmaceutics pharmaceutical pharmacy pharma pharmacodynamics pharmacokinetics pharmacophore molecule molecular formula skeletal structural structure geometry ball stick 3d