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MSH: A narcotic antagonist with some agonist properties. It is an antagonist at mu opioid receptors and an agonist at kappa opioid receptors. Given alone it produces a broad spectrum of unpleasant effects and it is considered to be clinically obsolete.,CSP: narcotic antagonist with some agonist properties; an antagonist at mu opioid receptors and an agonist at kappa opioid receptors.
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