title: Identification of 6-hydroxymelatonin in normal human urine by gas chromatography-mass spectrometry.
mesh_terms: D002849:Chromatography, Gas / Q000379:methods; D006801:Humans; D013058:Mass Spectrometry / Q000379:methods; D008550:Melatonin / Q000031:analogs & derivatives* / Q000378:metabolism / Q000652:urine
chemical_list: D008550:Melatonin; C012365:6-hydroxymelatonin