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Also known of 3-MFuF.
Starting dose for opiate novice/no tolerance reported to be around 10mg (per vendor before updating listing). As always, start low (sub milligram) and work your way up - but this is likely not a compound for tolerance individuals.
Very little is known, other than it seems to be a combination of 3-MF (3-Methylfentanyl/Mefentanyl) and lofentanyl molecules, but with much lower potency and duration.
Might be useful as a precursor if someone can figure out how to turn it into a more active compound without destroying it, but that is an unlikely scenario due to the way the molecule is structured (much more likely to destroy outer bonds than separate molecules)