3,4-MDO-U-47700 is an opioid analgesic which has been sold as a designer drug, first appearing in 2017 after U-47700 itself was banned in various jurisdictions.

It is less potent than U-47700 but is still a full agonist at the μ-opioid receptor, with slightly higher potency than morphine.

[1][2][3] It is illegal in Virginia.

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