A novel analogue of psilocybin was produced by hybrid chemoenzymatic synthesis in sufficient quantity to enable bioassay. Utilizing purified 4-hydroxytryptamine kinase from <i>Psilocybe cubensis</i>, chemically synthesized 5-methylpsilocin (<b>2</b>) was enzymatically phosphorylated to provide 5-methylpsilocybin (<b>1</b>). The zwitterionic product was isolated from the enzymatic step with high purity utilizing a solvent-antisolvent precipitation approach. Subsequently, <b>1</b> was tested for psychedelic-like activity using the mouse head-twitch response assay, which indicated activity that was more potent than the psychedelic dimethyltryptamine, but less potent than that of psilocybin.