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Mitragynine pseudoindoxyl is a rearrangement product of 7-hydroxymitragynine. It is an analgesic being more potent than morphine and about as potent as enkephalin.
Pharmacology
Mitragynine pseudoindoxyl is a μ opioid receptor agonist and δ opioid receptor antagonist and acts as a G-Protein biased agonist at μ opioid receptors and possesses a favourable side effect profile compared to conventional opioids.
References
Mitragynine pseudoindoxyl Wikipedia(Text) CC BY-SA