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R-30490 (also known as 4-Methoxymethylfentanyl) is an opioid analgesic relate to the highly potent animal tranquilizer carfentanil, and with only slightly lower potency. It was first synthesize by a team of chemists at Janssen Pharmaceutica led by Paul Janssen, who were investigating the structure-activity relationships of the fentanyl family of drugs. R-30490 was found to be the most selective agonist for the μ-opioid receptor out of all the fentanyl analogues tested, but it has never been introduce for medical use in humans, although the closely relate drug sufentanil is widely used for analgesia and anesthesia during major surgery. Buy Carfentanil Online

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