Recommended dosage: few miligrams. Please be careful and do your research.
Acetylfentanyl (Acetyl Fentanyl, Desmethyl Fentanyl) is an opioid analgesic drug that is an analog of fentanyl. Acetylfentanyl is know to be between 5 and 40 times more potent than heroin, up to 80 times more potent than morphine, but 15 times less potent than fentanyl.
Structural similarity to Fentanyl:

Density: 1.1 g/cm3
Boiling Point: 453.8 °C at 760 mmHg
Flash Point: 183.1 °C
Melting Point: 93-95 °C C
Synonyms : NIH 10485 , Desmethyl fentanyl , MCV 4848.
Formal Name:  N- phenyl- N- [1- (2- phenylmethyl)- 4- piperidinyl]- acetamide, monohydrochloride
CAS Number: 117332-89-5
Molecular Formula: C21H26N2O • HCl
Formula Weight: 358.9
Formulation: A crystalline solid
Purity ≥98%
Stability 2 years
Storage -20°C

Meanwhile Fentanyl is also addictive so must be handled with care .

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Therefor Fentanyl, also spelled fentanil, is an opioid used as a pain medication and together with other medications for anesthesia.Morealso It is also used as a recreational drug, often mixed with heroin or cocaine.[5] It has a rapid onset and its effects generally last under two hours.[3] Medically, it is used by injection, nasal spray, skin patch, or absorbed through the cheek (transmucosal) as a lozenge or tablet.

Firstly In recent years fentanyl has disrupted the North American drug market.

Certainly Fentanyl works primarily by activating μ-opioid receptors.[3] It is around 100 times stronger than morphine, about 50 times stronger than heroin. Some fentanyl analogues such as carfentanil are up to ~10,000 times stronger than morphine.

Common side effects include vomiting, constipation, sedation, confusion, hallucinations, nausea, and injuries related to poor coordination.[3][7] Serious side effects may include decreased breathing (respiratory depression), serotonin syndrome, low blood pressure, addiction, or coma. Similarly Fentanyl works primarily by activating μ-opioid receptors.[3] It is around 100 times stronger than morphine, about 50 times stronger than heroin. Some fentanyl analogues such as carfentanil are up to ~10,000 times stronger than morphine

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