N-(1-methyl-4-piperidinyl)-N-phenyl-propanamide, monohydrochloride known as N-methyl norfentanyl is classified as a suspected fentanyl precursor. It is a solid white material.
Fentanyl precursors are modified based on the structure of fentanyl with the absence of notable functional groups or structural features.
N-methyl norfentanyl was identified in 2019 as an emerging novel psychoactive substance, and has recently appeared in the 2021 Q4 DEA Tox report, citing 2 samples from Ohio.