Researchers at CaaMTech, the University of Massachusetts Dartmouth, and Canopy Growth USA published an article in ACS Omega detailing the synthesis, crystal structure, and serotonin receptor activity of the aeruginascin metabolite 4-HO-TMT1. They found that 4-AcO-TMT had a binding affinity at the four serotonin receptors 5-HT1A, 5-HT2A, 5-HT2B, and 5-HT3.
4-HO-TMT showed less binding affinity at 5-HT2A than psilocin. However, the authors concluded that the Ki values were comparable (670.0 nM and 107.2 nM, respectively). Also, the data showed that 4-HO-TMT has a similar affinity for 5-HT2B compared to psilocybin. The compound showed no activity at 5-HT3.