4-Methoxytryptamine
4-Methoxytryptamine (4-MeO-T; developmental code name PAL-548) is a serotonin receptor modulator of the tryptamine and 4-hydroxytryptamine families. It is the O-methyl derivative of 4-hydroxytryptamine (4-HT) and a positional isomer of 5-methoxytryptamine and 6-methoxytryptamine.