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4-HO-MPT

From Wikipedia, the free encyclopedia

Pharmaceutical compound
4-HO-MPT
Clinical data
Other names4-OH-MPT; 4-Hydroxy-N-methyl-N-propyltryptamine; Meprocin
Routes of
administration
Oral[1][2]
Drug classNon-selectiveserotonin receptor agonist;Serotonin5-HT2A receptoragonist;Serotonergic psychedelic;Hallucinogen
ATC code
  • None
Identifiers
  • 3-[2-[methyl(propyl)amino]ethyl]-1H-indol-4-ol
CAS Number
PubChemCID
ChemSpider
UNII
CompTox Dashboard(EPA)
Chemical and physical data
FormulaC14H20N2O
Molar mass232.327 g·mol−1
3D model (JSmol)
  • OC1=CC=CC2=C1C(CCN(C)CCC)=CN2
  • InChI=1S/C14H20N2O/c1-3-8-16(2)9-7-11-10-15-12-5-4-6-13(17)14(11)12/h4-6,10,15,17H,3,7-9H2,1-2H3 checkY
  • Key:XFQDDPQGBLSNCN-UHFFFAOYSA-N checkY
  (verify)

4-HO-MPT, also known as4-hydroxy-N-methyl-N-propyltryptamine or asmeprocin, is apsychedelic drug of thetryptamine and4-hydroxytryptamine families.[1][2] It is a higherhomologue ofpsilocin (4-HO-DMT) as well as the 4-hydroxylanalogue ofN-methyl-N-propyltryptamine (MPT).[1][2] The drug is takenorally.[1][2]

It acts as anon-selectiveserotonin receptor agonist, including of theserotonin5-HT2A receptor.[3][4] The drug produces psychedelic-like effects in animals.[2][3]

4-HO-MPT was first described in thescientific literature by 1981.[5] It was encountered as a noveldesigner drug by 2021.[6]

Use and effects

[edit]

The dose andduration of 4-HO-MPT are listed as "unknown" inAlexander Shulgin's bookTiHKAL (Tryptamines I Have Known and Loved).[1] In more recent publications, the dose has been reported to be 20 to 30 mgorally, with a mean dose of 25 mg.[2] In a single trial of 8 mg 4-HO-MPThydrochloride orally fromTiHKAL, it was described as producingvisual distortion,vertigo, and slightinsomnia.[1]

Interactions

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See also:Psychedelic drug § Interactions, andTrip killer § Serotonergic psychedelic antidotes

Pharmacology

[edit]

Pharmacodynamics

[edit]
4-HO-MPT activities
TargetAffinity (Ki, nM)
5-HT1A106–910 (Ki)
490 (EC50Tooltip half-maximal effective concentration)
90% (EmaxTooltip maximal efficacy)
5-HT1B224
5-HT1D170
5-HT1E246
5-HT2A71–114 (Ki)
3.8–64a (EC50)
53%a–98% (
Emax)
5-HT2B8 (Ki)
3.4 (EC50)
58% (
Emax)
5-HT2C150–203 (Ki)
46–66a (EC50)
83–100%a (
Emax)
5-HT5A664
5-HT648
5-HT799
α2A3,625
α2B1,844
α2CIA
D2IA
D3921
D4,D5IA
H192
H2IA
M4IA
σ1891
σ21,166
KORIA
NR2B3,658
SERTTooltip Serotonin transporter910–1,180 (Ki)
575 (IC50Tooltip half-maximal inhibitory concentration)
DATTooltip Dopamine transporterIA
Notes: The smaller the value, the more avidly the drug binds to the site.Footnotes:a = Stimulation ofIP1Tooltip inositol phosphate formation.Sources:[3][4][7]

4-HO-MPT acts as apotentagonist of theserotonin5-HT2A,5-HT2B, and5-HT2C receptors.[3][4] It is apartial orfull agonist of the serotonin 5-HT2A receptor, a moderate-efficacypartial agonist of the serotonin 5-HT2B receptor, and a high-efficacy partial agonist of the serotonin 5-HT2C receptor.[3][8] The drug has more than an order of magnitude higher potency as an agonist of the serotonin 5-HT2A and 5-HT2B receptors than as an agonist of the serotonin 5-HT2C receptor.[3] It also interacts with otherserotonin receptors such as5-HT6 and5-HT7 receptors with high affinity and non-serotonergictargets.[4] Additionally it inhibitsserotonin transporter.[9]

4-HO-MPT produces thehead-twitch response, a behavioral proxy ofpsychedelic effects, in rodents.[2][3]

Chemistry

[edit]

Synthesis

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Thechemical synthesis of 4-HO-MPT has been described.[1]

Analogues

[edit]

Analogues of 4-HO-MPT includemethylpropyltryptamine (MPT),4-AcO-MPT,5-MeO-MPT,psilocin (4-HO-DMT),4-HO-DET (ethocin),4-HO-DPT (deprocin),4-HO-MET (metocin), and4-HO-PiPT (iprocin), among others.[1]

History

[edit]

4-HO-MPT was first described in thescientific literature byDavid Repke and colleagues in 1981.[5] Subsequently, its effects in humans were described byAlexander Shulgin in his 1997 bookTiHKAL (Tryptamines I Have Known and Loved).[1] The drug was encountered as a noveldesigner drug by 2021.[6]

Society and culture

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Legal status

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International

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4-HO-MPT is not scheduled by theUnited Nations'Convention on Psychotropic Substances.[10]

United States

[edit]

4-HO-MPT is notscheduled at thefederal level in theUnited States,[11] but it is possible that 4-HO-MPT could legally be considered ananalog ofpsilocin, in which case, sales orpossession with intent for human consumption could potentially be prosecuted under theFederal Analogue Act.[12]

See also

[edit]

References

[edit]
  1. ^abcdefghi4-HO-MPT Entry inTIHKAL @ Erowid.org
  2. ^abcdefgHalberstadt AL, Chatha M, Klein AK, Wallach J, Brandt SD (May 2020)."Correlation between the potency of hallucinogens in the mouse head-twitch response assay and their behavioral and subjective effects in other species"(PDF).Neuropharmacology.167 107933.doi:10.1016/j.neuropharm.2019.107933.PMC 9191653.PMID 31917152.Table 4 Human potency data for selected hallucinogens. [...]
  3. ^abcdefgKlein AK, Chatha M, Laskowski LJ, Anderson EI, Brandt SD, Chapman SJ, et al. (April 2021)."Investigation of the Structure-Activity Relationships of Psilocybin Analogues".ACS Pharmacology & Translational Science.4 (2):533–542.doi:10.1021/acsptsci.0c00176.PMC 8033608.PMID 33860183.
  4. ^abcdGlatfelter GC, Naeem M, Pham DN, Golen JA, Chadeayne AR, Manke DR, et al. (April 2023)."Receptor Binding Profiles for Tryptamine Psychedelics and Effects of 4-Propionoxy-N,N-dimethyltryptamine in Mice".ACS Pharmacology & Translational Science.6 (4):567–577.doi:10.1021/acsptsci.2c00222.PMC 10111620.PMID 37082754.
  5. ^abRepke DB, Ferguson WJ, Bates DK (1981)."Psilocin analogs II. Synthesis of 3‐[2‐(dialkylamino)ethyl]‐, 3‐[2‐( N ‐methyl‐ N ‐alkylamino)ethyl]‐, and 3‐[2‐(cycloalkylamino)ethyl]indol‐4‐ols".Journal of Heterocyclic Chemistry.18 (1):175–179.doi:10.1002/jhet.5570180131.ISSN 0022-152X. Retrieved9 October 2025.
  6. ^abTanaka R, Kawamura M, Hakamatsuka T, Kikura-Hanajiri R (2021)."Identification of six tryptamine derivatives as designer drugs in illegal products".Forensic Toxicology.39 (1):248–258.doi:10.1007/s11419-020-00556-5.ISSN 1860-8965. Retrieved9 October 2025.
  7. ^Kozell LB, Eshleman AJ, Swanson TL, Bloom SH, Wolfrum KM, Schmachtenberg JL, et al. (April 2023)."Pharmacologic Activity of Substituted Tryptamines at 5-Hydroxytryptamine (5-HT)2A Receptor (5-HT2AR), 5-HT2CR, 5-HT1AR, and Serotonin Transporter".The Journal of Pharmacology and Experimental Therapeutics.385 (1):62–75.doi:10.1124/jpet.122.001454.PMC 10029822.PMID 36669875.
  8. ^Kozell LB, Eshleman AJ, Swanson TL, Bloom SH, Wolfrum KM, Schmachtenberg JL, et al. (April 2023)."Pharmacologic Activity of Substituted Tryptamines at 5-Hydroxytryptamine (5-HT)2A Receptor (5-HT2AR), 5-HT2CR, 5-HT1AR, and Serotonin Transporter".The Journal of Pharmacology and Experimental Therapeutics.385 (1):62–75.doi:10.1124/jpet.122.001454.PMC 10029822.PMID 36669875.
  9. ^Kozell LB, Eshleman AJ, Swanson TL, Bloom SH, Wolfrum KM, Schmachtenberg JL, et al. (April 2023)."Pharmacologic Activity of Substituted Tryptamines at 5-Hydroxytryptamine (5-HT)2A Receptor (5-HT2AR), 5-HT2CR, 5-HT1AR, and Serotonin Transporter".The Journal of Pharmacology and Experimental Therapeutics.385 (1):62–75.doi:10.1124/jpet.122.001454.PMC 10029822.PMID 36669875.
  10. ^"Convention on Psychotropic Substances, 1971". Archived fromthe original on 2022-01-19. Retrieved2016-06-10.
  11. ^"§1308.11 Schedule I." Archived fromthe original on 2009-08-27. Retrieved2016-06-10.
  12. ^Erowid Analog Law Vault : Federal Controlled Substance Analogue Act Summary

External links

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