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. Author manuscript; available in PMC: 2026 Feb 17.
Published in final edited form as: Arch Toxicol. 2022 Apr 21;96(6):1865–1880. doi: 10.1007/s00204-022-03294-2

Table 1.

MOR affinities of N-piperidinyl etonitazene, fentanyl and morphine. Ki values (nM) are given as mean ± SD for n = 3 experiments, each performed in triplicate.

Ki values (nM) MOR
[3H]DAMGO
N-piperidinyl etonitazene 14.3 ± 2.5
Fentanyl 6.17 ± 0.82
Morphine 3.99 ± 0.40