5F-MN24 (5-fluoro-N-methyl-1-(naphthalen-1-yl)propan-2-amine)
Is a synthetic cannabinoid belonging to the indole-3-carboxamide family, designed to probe the endocannabinoid system in laboratory settings. More recently, it has appeared as an illicit research chemical and in herbal smoking mixtures, prized by clandestine manufacturers for its potent CB₁ receptor activation and evasion of early scheduling efforts. Its novel structure and high efficacy raise serious concerns among toxicologists and regulatory bodies.
Chemical Identity and Structure
IUPAC Name: N-methyl-1-(naphthalen-1-yl)-2-(5-fluoro-1H-indol-3-yl)propan-1-amine
Common Name: 5F-MN24
Chemical Class: Indole-3-carboxamide synthetic cannabinoid
Molecular Formula: C₂₂H₂₃FN₂O
Molecular Weight: 354.43 g/mol
Physical Form: White to off-white crystalline powder
5F-MN24 unites a fluorinated pentyl side chain on the indole core with a naphthyl propanamine substituent, increasing lipophilicity and receptor affinity compared to simpler analogues.
Pharmacology and Mechanism of Action
5F-MN24 functions as a full agonist at both CB₁ and CB₂ receptors:
Receptor Affinity: Low-nanomolar Ki at CB₁, indicating high potency
Onset: Rapid (minutes when inhaled or vaporized)
Duration: 2–5 hours, with peak effects in the first 60–90 minutes
Activation of CB₁ receptors leads to:
Intense euphoria and relaxation
Altered perception of time, space, and sensory input
Sedation or catalepsy at higher doses
Impaired motor coordination and cognitive function
Unlike THC’s partial agonism, 5F-MN24’s full agonist profile can produce far more pronounced and unpredictable psychoactive responses.
Toxicity and Adverse Effects
Because of its full-agonist nature and narrow therapeutic index, 5F-MN24 poses significant health risks:
Neurological: agitation, anxiety, paranoia, hallucinations, seizures
Cardiovascular: tachycardia, hypertension, chest pain
Psychiatric: acute psychosis, confusion, self-harm ideation
Respiratory: depressed breathing in overdose scenarios
Variable purity and dosing in street preparations greatly increase the likelihood of accidental overdose, with documented cases of collapse and extreme sedation requiring urgent medical intervention.
Legal Status and Regulatory Control
To date, 5F-MN24 has been subject to emergency scheduling or analogue controls in many jurisdictions:
United States: Treated as a Schedule I analogue of existing synthetic cannabinoids
United Kingdom: Controlled under the Psychoactive Substances Act (PSA)
European Union: Many member states have enacted rapid bans or temporary controls
Australia & Canada: Included in broad synthetic cannabinoid prohibitions
Unauthorized manufacture, distribution, or possession can result in criminal charges, although clandestine chemists often modify structures to stay ahead of regulations.
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