1) Synthetic opioid 
<chemical> A narcotic antagonist with analgesic properties. It is used for the control of moderate to severe pain. ... Pharmacological action: analgesics, opioid, narcotic antagonists, narcotics. ... Chemical name: Phenol, 3-(3-ethylhexahydro-1-methyl-1H-azepin-3-yl)- ... (12 Dec 1998) ...