Semi-synthetic cannabinoid
Status changingabeo-HHC acetate
[(6aR,11aR)-6,6-dimethyl-3-pentyl-7,8,9,10,11,11a-hexahydro-6aH-cyclohepta[c]chromen-1-yl] acetate
Aliases.Acétate d'abeo-HHC · (6aR,11aR)-6,6-diméthyl-3-pentyl-6,6a,7,8,9,10,11,11a-octahydrobenzo[b]cyclohepta[d]pyran-1-yl acétate
The acetate ester of a ring-expanded HHC, described in 1984: no published pharmacological data.
Updated on
Level of detail
Harm-reduction warning
No characterised human dose: animal / in vitro data only. Effect profile, safety margin and acute toxicity are not documented in human clinical practice. Extremely potent compound: severe effects, seizures and deaths reported in the literature.
Identifiers
- Formula
- C₂₃H₃₄O₃
- Molar mass
- 358.25 g·mol⁻¹
- CAS
- 96290-83-4
- PubChem CID
- 177841621
- First described
- Décrite en 1984 par Srebnik et Mechoulam, dans un article de chimie consacré à la stéréochimie des hydrazones de cannabinoïdes. La molécule y apparaît comme le produit d'un réarrangement du squelette du delta-11-tétrahydrocannabinol, réarrangement qui fait passer le cycle carboné de six à sept atomes. Ce travail est purement chimique et ne comporte aucun volet biologique. Depuis, aucune étude pharmacologique ne lui a été consacrée : la molécule refait surface en 2023 dans la revue de synthèse d'István Ujváry sur l'hexahydrocannabinol et les cannabinoïdes semi-synthétiques apparentés, où elle est citée parmi les analogues connus, puis dans des bases de données chimiques comme PubChem, sans étude nouvelle derrière.
- Origin
- A molecule that comes entirely from the laboratory. Hemp does not produce it: the plant makes delta-9-THC, CBD and their acidic precursors, but no cannabinoid whose carbon ring counts seven atoms has ever been isolated from Cannabis sativa. abeo-HHC acetate is therefore the result of a chemical transformation applied to a cannabinoid of plant origin, followed by esterification of the phenol at position 1. It has been described only in a research context, and there is nothing to indicate that it circulates on the market for semi-synthetic cannabinoids.
- InChIKey
- NTJCIGWEPIAFSM-RTBURBONSA-N
In plain terms
abeo-HHC acetate is a laboratory molecule, obtained by modifying the framework of a hemp cannabinoid: one of its carbon rings has been enlarged by one atom. It does not exist in the plant and has never been studied in the body, either in animals or in humans. It therefore has no food, cosmetic or therapeutic use, and its place in a consumer product would be indefensible.
Receptors and activity
- CB1Partial agonist
- Agonist
- Partial agonist
- Antagonist
- Modulator
- Inverse agonist
Hover over a row for the precise value (Ki, EC50…)
Subjective signature
Hover over an axis to read its definition.
- Calm5
- Clarity5
- Sleep5
- Appetite5
- High5
Editorial estimate, not clinical.
Pharmacology
In pharmacological terms, this entry describes first of all a void. abeo-HHC acetate is a tricyclic cannabinoid of the chromene type whose saturated carbon ring counts seven atoms instead of six, the result of a rearrangement of the delta-11-THC skeleton described in 1984, and its phenol at position 1 is blocked by an acetate group. In THC, this free phenol takes part in the interaction with the CB1 receptor, a receptor of which THC is a partial agonist. For abeo-HHC acetate, nothing comparable has been measured: no CB1 or CB2 affinity, no functional assay, no data on TRPV1, GPR55, PPAR gamma or 5-HT1A, no pharmacokinetic or metabolism work. A search by name in the indexed biomedical literature returns no article, and human data are entirely lacking. What can be stated belongs to chemistry: the molecule has been synthesised and characterised, it has a CAS number and a PubChem entry, and it is mentioned in a 2023 review devoted to hexahydrocannabinol and its semi-synthetic analogues. Everything else is unknown, and it would be dishonest to fill this void with results obtained on neighbouring molecules: hexahydrocannabinol acetate (HHC-O), for example, is a different substance, classified by name as a narcotic in France, and its data are not transferable here.
Key sources.
- Srebnik M, Mechoulam R. Reactions of cannabinoid tosylhydrazones: stereochemical aspects. Tetrahedron, 1984 (première description de la molécule)DOI 10.1016/S0040-4020(01)88815-3
- Ujváry I. Hexahydrocannabinol and closely related semi-synthetic cannabinoids: A comprehensive review. Drug Testing and Analysis, 2024;16(2):127-161PMID 37269160
- PubChem, fiche CID 177841621 (abeo-HHC acetate), aucune section pharmacologie
- ANSM, liste consolidée des substances classées comme stupéfiants, mise à jour du 16 février 2026 (clause générique benzo[c]chromène issue de la décision du 22 mai 2024 ; HHC, HHC-O et HHCP classés par la décision du 12 juin 2023 ; aucune mention d'abeo)
- Arrêté du 22 février 1990 fixant la liste des substances classées comme stupéfiants, annexe IV, clause sur les tétrahydrocannabinols, leurs esters, éthers et sels (Légifrance)
- Europe PMC, recherche plein texte sur le terme abeo-HHC, zéro résultat (consultée en juillet 2026)
Route of preparation (chemical process)
No known biosynthetic pathway, since hemp does not make this molecule. The skeleton comes from a chemical rearrangement of delta-11-tetrahydrocannabinol, which widens its carbon ring by one atom, and the acetate function is then carried by the phenol at position 1. It is therefore a semi-synthetic product, obtained from a plant cannabinoid, and described only in the chemical literature.
Legal framework
France
abeo-HHC acetate is not listed by name on the French narcotics list: the term abeo appears nowhere in the consolidated list published by the ANSM and updated on 16 February 2026. The question therefore falls to a generic clause. Two clauses may be invoked. The decree of 22 February 1990, annex IV, classifies tetrahydrocannabinols, their esters, their ethers and their salts; yet this molecule is not a tetrahydrocannabinol in the strict sense, since its carbon ring has been enlarged and saturated. The decision of 22 May 2024, supplemented by that of 3 June 2024, goes much further: it classifies any substance derived from the benzo[c]chromene core, non-hydrogenated, partially or fully hydrogenated on ring A, bearing at position 1 a hydroxyl function, esterified or not. abeo-HHC acetate corresponds exactly to this pattern of a phenol esterified at position 1, with one reservation: its carbon ring counts seven atoms and not six, so that its core is written cyclohepta[c]chromene and not benzo[c]chromene. Whether this rearrangement brings it within or outside the scope of the clause has not been publicly settled. As a point of reference, hexahydrocannabinol, hexahydrocannabinol acetate (HHC-O) and hexahydrocannabiphorol are, for their part, classified by name as narcotics since the decision of 12 June 2023. In every case, this molecule has no place in a consumer product.
European Union
No European Union text, and no public EUDA document, covers this molecule by name: it is the subject neither of a risk assessment report nor of a European control measure. The applicable framework remains national and varies considerably between Member States: several countries have classified hexahydrocannabinol and its esters by name from 2023 onwards, while others, such as France, rely on generic clauses covering derivatives of the benzo[c]chromene core. At international level, the molecule appears neither in the schedules of the 1961 Single Convention on Narcotic Drugs nor in those of the 1971 Convention on Psychotropic Substances.
Sources: EUR-Lex, UNODC, CND, ANSM, IUPHAR/BPS, ChEBI, EUDA. Our method.
Structural classification
- Class
- Semi-synthetic cannabinoid
- Origin
- A molecule that comes entirely from the laboratory. Hemp does not produce it: the plant makes delta-9-THC, CBD and their acidic precursors, but no cannabinoid whose carbon ring counts seven atoms has ever been isolated from Cannabis sativa. abeo-HHC acetate is therefore the result of a chemical transformation applied to a cannabinoid of plant origin, followed by esterification of the phenol at position 1. It has been described only in a research context, and there is nothing to indicate that it circulates on the market for semi-synthetic cannabinoids.
- Status
- Status changing
Cannabinoïde tricyclique de type chromène à squelette réarrangé, ce que signale le préfixe abeo : le cycle carboné saturé compte sept atomes, d'où le noyau cyclohepta[c]chromène là où le THC et l'HHC portent un noyau benzo[c]chromène. Le phénol en position 1 est estérifié sous forme d'acétate, et la chaîne latérale est un pentyle, comme chez le THC.
Toxicology and risks
Aucune donnée de toxicologie n'existe pour cette molécule : ni étude animale, ni cas clinique, ni analyse de produit saisi, ni évaluation réglementaire. Les données humaines manquent entièrement, et la seule publication expérimentale qui la mentionne est un travail de chimie de 1984 dépourvu de volet biologique. Cette absence ne vaut pas absence de risque : une molécule jamais évaluée reste une molécule dont les effets, les organes cibles et la marge de sécurité sont inconnus. Les constats de sécurité établis pour d'autres cannabinoïdes de synthèse partielle appartiennent à ces molécules et ne peuvent pas lui être attribués.
Detection and analysis
Aucune méthode analytique validée, aucun spectre de référence et aucun signalement en laboratoire de contrôle n'ont été publiés sous ce nom. Les identifiants informatiques existent, avec un numéro CAS et une fiche PubChem, mais aucun protocole de criblage ou de confirmation documenté ne les accompagne dans la littérature.
References
- 1.Srebnik M, Mechoulam R. Reactions of cannabinoid tosylhydrazones: stereochemical aspects. Tetrahedron, 1984 (première description de la molécule)DOI 10.1016/S0040-4020(01)88815-3
- 2.Ujváry I. Hexahydrocannabinol and closely related semi-synthetic cannabinoids: A comprehensive review. Drug Testing and Analysis, 2024;16(2):127-161PMID 37269160
- 3.PubChem, fiche CID 177841621 (abeo-HHC acetate), aucune section pharmacologie
- 4.ANSM, liste consolidée des substances classées comme stupéfiants, mise à jour du 16 février 2026 (clause générique benzo[c]chromène issue de la décision du 22 mai 2024 ; HHC, HHC-O et HHCP classés par la décision du 12 juin 2023 ; aucune mention d'abeo)
- 5.Arrêté du 22 février 1990 fixant la liste des substances classées comme stupéfiants, annexe IV, clause sur les tétrahydrocannabinols, leurs esters, éthers et sels (Légifrance)
- 6.Europe PMC, recherche plein texte sur le terme abeo-HHC, zéro résultat (consultée en juillet 2026)
Structured data
- InChIKey
- NTJCIGWEPIAFSM-RTBURBONSA-N
- SMILES
- CCCCCc1cc(OC(C)=O)c2c(c1)OC(C)(C)[C@@H]1CCCCC[C@@H]21
- Formula
- C23H34O3
- Molar mass
- 358.25 g·mol⁻¹
- CAS
- 96290-83-4
- PubChem CID
- 177841621
LLM ingestion format: a structured superset of the entry (identifiers, binding, versioned legal status). Full corpus.