4-HO-McPeT4-HO-McPeT, also known as 4-hydroxy-N-methyl-N-cyclopentyltryptamine, is a tryptamine derivative related to known psychedelic tryptamines like psilocin. It was described in the scientific literature by David Repke and colleagues in 1981.ChemistryAnaloguesAnalogues of 4-HO-McPeT include 4-HO-McPT, 4-HO-DsBT, 4-HO-MPMI, 4-HO-pyr-T, and PiPT, among others.