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U-47700 is an analgesic of the opioid family first developed by Upjohn some 40 years ago. It was derived form a related opioid, AH-7921. Despite its importance in developing this class of opioid chemicals, U-47700 has never itself been formally tested on humans or animals.
U-47700 is highly selective for the µ-opioid receptor, and is believed to be roughly 7 to 8 times as powerful as morphine dose-per-dose. It is believed to be a strong kappa agonist, so should not produce substantial degrees of dysphoria or other unwanted effects.
Sweden has outlawed U-47700 as of January 2016, but no other major jurisdictions have yet followed suit.
U-47700, like most opioids and their derivatives, is not suitable for human consumption. It is sold only to research chemists and laboratory personnel.