Menu
Home
People
Places
Arts
History
Plants & Animals
Science
Life & Culture
Technology
Reference.org
Norfentanyl
open-in-new
<p>Norfentanyl is an inactive synthetic <a href="/facts/Opioid/EGnE2x99">opioid</a> <a href="/facts/Analgesic/xLj4XBcq">analgesic</a> <a href="/facts/Medication/h9mhwWP2">drug</a> precursor. It is an <a href="/facts/Structural_analog/3aysWSVG">analog</a> and metabolite of <a href="/facts/Fentanyl/MMD9GdD3">fentanyl</a> with the removal of the phenethyl moiety (or functional group) from fentanyl chemical structure. </p>