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  • 3-[2-[cyclopentyl(methyl)amino]ethyl]-1H-indol-4-ol
CAS Number
PubChem CID
Chemical and physical data
Formula C16H22N2O
Molar mass 258.359 g·mol−1
3D model (JSmol)
  • InChI=1S/C16H22N2O/c1-18(13-5-2-3-6-13)10-9-12-11-17-14-7-4-8-15(19)16(12)14/h4,7-8,11,13,17,19H,2-3,5-6,9-10H2,1H3

4-HO-McPeT (4-hydroxy-N-methyl-N-cyclopentyltryptamine) is a tryptamine derivative which has serotonergic effects. [1]

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4-HO-McPT Chemical compound

4-HO-McPT (4-hydroxy-N-methyl-N-cyclopropyltryptamine) is a psychedelic tryptamine derivative. It has serotonergic effects, and has reportedly been sold as a designer drug since around 2016, but was not definitively identified by forensic laboratories until 2018. It is illegal in Finland.


5-MeO-MET (5-Methoxy-N-methyl-N-ethyltryptamine) is a relatively rare designer drug from the substituted tryptamine family, related to compounds such as N-methyl-N-ethyltryptamine and 5-MeO-DMT. It was first synthesised in the 1960s and was studied to a limited extent, but was first identified on the illicit market in June 2012 in Sweden. It was made illegal in Norway in 2013, and is controlled under analogue provisions in numerous other jurisdictions.


  1. Repke DB, Ferguson WJ, Bates DK (January 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): 175–9. doi:10.1002/jhet.5570180131.