Ethylketazocine
Ethylketazocine, is an opioid drug of the benzomorphan family which has been used extensively in scientific research in the last few decades as a tool to aid in the study of the κ-opioid receptor. However, due to its relatively poor selectivity for the κ-opioid receptor over the μ- and δ-opioid receptors, as well as its relatively poor intrinsic activity at all sites, it has been mostly replaced in recent times by newer and more potent and selective compounds like U-50,488 and ICI-199,441.
