1. Benzylfentanyl has a K i of 213nM at the mu opioid receptor, binding around 200x less strongly than fentanyl itself.
  2. It was temporarily placed in the US Schedule I by emergency scheduling in 1985 due to concerns about its potential for abuse as a designer drug, but this placement was allowed to expire and benzylfentanyl was formally removed from controlled substance listing in 2010, after the DEA's testing determined it to be " essentially inactive " as an opioid.
  3. It's difficult to find benzylfentanyl in a sentence. 用benzylfentanyl造句挺难的


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