title: Selective gas chromatographic-mass spectrometric methods for the quantitation of normetanephrine, metanephrine and vanillylmandelic acid.
mesh_terms: D002849:Chromatography, Gas; D004837:Epinephrine / Q000032:analysis*; D004952:Esters / Q000032:analysis; D006900:Hydroxylation; D007536:Isomerism; D013058:Mass Spectrometry; D008722:Methods; D008738:Methyl Ethers / Q000032:analysis; D008745:Methylation; D009647:Normetanephrine / Q000032:analysis*; D014642:Vanilmandelic Acid / Q000032:analysis*
chemical_list: D004952:Esters; D008738:Methyl Ethers; D009647:Normetanephrine; D014642:Vanilmandelic Acid; D004837:Epinephrine