4-HO-EiBT4-HO-EiBT, also known as 4-hydroxy-N-ethyl-N-isobutyltryptamine or as eibucin, is a substituted tryptamine derivative which acts as a serotonin 5-HT2A receptor agonist, with an of 27.7nM and an efficacy of 97.5%.. Retrieved 2025-05-12ChemistryAnaloguess of 4-HO-EiBT include 4-HO-DiPT, 4-HO-DsBT, 4-HO-McPT, 4-HO-McPeT, 4-HO-MiPT, and 4-HO-PiPT, among others.