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    Acetylfentanyl molecular structure

    Acetylfentanyl Stats & Data

    A-f Desmethyl fentanyl Wrongly called china white acetyl-fentanyl
    NPS DataHub
    MW322.45
    FormulaC21H26N2O
    CAS3258-84-2
    IUPACN-phenyl-N-[1-(2-phenylethyl)piperidin-4-yl]acetamide
    SMILESCC(=O)N(c1ccccc1)C1CCN(CCc2ccccc2)CC1
    InChIKeyFYIUUQUPOKIKNI-UHFFFAOYSA-N
    Phenethylamines; 2020/1. Von 2-Phenethylamin abgeleitete Verbindungen; 2021/1. Von 2-Phenethylamin abgeleitete Verbindungen; 2022/1. Von 2-Phenethylamin abgeleitete Verbindungen
    Chemical Class Opioid
    Psychoactive Class Depressant

    Receptor Profile

    Receptor Actions

    Agonists
    μ-opioid receptor agonist (full)

    Receptor Binding

    opioid agonist

    History & Culture

    1960s–1980s

    Acetylfentanyl was first described in patents from Research Laboratorium Dr. C. Janssen (Janssen Pharmaceutica), a Belgian pharmaceutical company. Its analgesic activity was characterized in a 1968 patent by Paul Janssen, the company's founder. The compound was discovered contemporaneously with fentanyl itself during Janssen's extensive research into piperidine-based analgesics. Despite its discovery alongside fentanyl, acetylfentanyl was never developed for therapeutic applications or licensed for medical use. During the late 1980s, the compound appeared occasionally on illicit drug markets but remained uncommon compared to other opioids available at the time.

    2012–2015

    Acetylfentanyl's modern history began in 2012 when online discussion about the substance increased and reports of seizures appeared. Initial reports of recreational use emerged from Russia, where the compound was detected in smoking "spices" (synthetic cannabinoid products). At least twelve deaths associated with acetylfentanyl, some involving morphine as a co-intoxicant, were reported in this region. By 2013, the substance had spread more widely. In late April 2013, police in Montreal, Canada conducted raids on seven locations and recovered approximately 300,000 drug tablets, of which 11,000 were found to contain acetylfentanyl. A separate three kilograms of acetylfentanyl powder was also confiscated during these operations. In the United States, the first laboratory submission involving acetylfentanyl occurred in Maine in April 2013. The drug was frequently mixed with heroin or sold in its place, contributing to unexpected overdoses among users unaware of its presence. The compound continued to proliferate through 2014 and 2015. According to the EU Early Warning System Network, the first European Union seizure was reported in Poland in 2014, followed by three seizures in Finland—two originating from China and one from Belgium. Japan first identified acetylfentanyl in drug products in 2014. In November 2015, the substance was seized for the first time in Western Australia, where it was found pressed into tablets designed to resemble PEZ candies. Most large shipment seizures during this period involved packages originating in China.

    2013–2015

    The proliferation of acetylfentanyl precipitated a significant public health crisis, particularly in the United States and Europe. Between March and May 2013, the Centers for Disease Control and Prevention issued a health alert following fourteen overdose deaths among intravenous drug users in Rhode Island, with victims ranging in age from 19 to 57 years. Pennsylvania experienced a pronounced outbreak, prompting state authorities to request that coroners and medical examiners screen for acetylfentanyl. This investigation attributed at least fifty fatalities to either fentanyl or acetylfentanyl during the first half of 2013. Florida similarly reported a rise in fentanyl and acetylfentanyl-related deaths beginning in late 2013. By July 2015, the DEA had confirmed fifty-two fatalities involving acetylfentanyl in the United States between 2013 and 2015. In Europe, acetylfentanyl was analytically confirmed in thirty-two fatalities across four member states between 2013 and August 2015, with Sweden recording twenty-seven deaths, the United Kingdom two, Germany two, and Poland one. The European Monitoring Centre for Drugs and Drug Addiction issued an alert about the drug in September 2015 following twenty-two confirmed deaths. More broadly, fentanyl analogs have been responsible for hundreds of deaths throughout Europe and the former Soviet republics since a resurgence in their use began in Estonia in the early 2000s.

    Effect Profile

    Curated + 5 Reports
    Opioid 8.4

    Strong euphoria and pain relief with moderate sedation, mild itching/nausea

    Euphoria / Warmth×3
    10
    Analgesia×2
    8
    Sedation / Relaxation×1
    7
    Itching / Nausea×1
    4

    Tolerance & Pharmacokinetics

    drugs.wiki

    Tolerance Decay

    Full tolerance 1d Half tolerance 21d Baseline ~35d

    Experience Report Analysis

    Erowid
    5 Reports
    2012–2015 Date Range
    4 With Age Data

    Demographics

    Gender Distribution

    Age Distribution

    Reports Over Time

    Form / Preparation

    Most common forms and preparations reported

    Legal Status

    UN Single Convention on Narcotic Drugs 1961 (Schedule I and Schedule IV, added 2016)
    Country Status Notes
    Austria Controlled (SMG) Listed in Annex 1 of the Narcotic Substances Regulation under the Suchtmittelgesetz (Narcotics Act).
    Canada Schedule I (CDSA) Controlled as an analog of fentanyl under the Controlled Drugs and Substances Act. Manufacturing, possession, and distribution are prohibited.
    China Category I Psychotropic Substance Controlled since October 1, 2015. Illegal to sell, buy, import, export, and manufacture.
    Cyprus Controlled Controlled since 2013 via Regulatory Administrative Act 162/13 within updates to law L29/77. Falls under a generic clause addressing all fentanyl chemical groups.
    Estonia Controlled Added to national drug control legislation on June 8, 2015.
    Finland Liite 4 (Annex 4) Controlled as a narcotic substance under Annex 4 of drug control legislation since September 28, 2015.
    Germany Anlage II BtMG Controlled under Anlage II of the Betäubungsmittelgesetz (Narcotics Act) since June 20, 2017. Manufacturing, possession, import, export, purchase, sale, procurement, and dispensing without a license is prohibited.
    Ireland Schedule I Controlled under Schedule I of the Misuse of Drugs Regulation 1988 (S.I. 328 of 1988).
    Japan Controlled Listed as a controlled substance under Japanese drug control legislation.
    Latvia List I Included in the first list of Cabinet Regulation N 847, which governs narcotic substances, psychotropic substances, and precursors controlled in Latvia.
    Lithuania Controlled Placed under control pursuant to Republic of Lithuania Minister of Health Order No V-1062 (September 21, 2015), amending the narcotic and psychotropic substances lists.
    Norway Controlled Regulated under the Medicines Act (Legemiddelloven).
    Poland Controlled (Substitute Drug) Controlled under the definition of 'substitute drug' per the Act of October 8, 2010 amending the Act on counteracting drug addiction. Article 44b prohibits manufacturing or introducing substitute drugs to trade.
    Russia Schedule I Classified as a Schedule I controlled substance. Possession, production, and distribution are prohibited.
    Sweden Controlled Regulated as a controlled substance since August 2015.
    Switzerland Verzeichnis D Specifically named as a controlled substance under Verzeichnis D of Swiss narcotics legislation.
    Turkey Illegal Prohibited since February 2016 under Turkish drug control legislation.
    United Kingdom Class A Made a Class A controlled substance in 1986 as an analogue of fentanyl under the Misuse of Drugs Act 1971 (Modification) Order 1986. Class A substances carry the most severe penalties under UK law.
    United States Schedule I Temporarily placed in Schedule I on July 17, 2015 via Federal Register notice and subsequently permanently scheduled. Classified as having high abuse potential with no accepted medical use. Federal prosecutions for distribution have resulted in multi-year prison sentences.
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