title: Quantitative analysis of 6-hydroxymelatonin in human urine by gas chromatography--negative chemical ionization mass spectrometry.
mesh_terms: D004355:Drug Stability; D005260:Female; D008401:Gas Chromatography-Mass Spectrometry; D006801:Humans; D008297:Male; D008550:Melatonin / Q000031:analogs & derivatives* / Q000652:urine
chemical_list: D008550:Melatonin; C012365:6-hydroxymelatonin