title: Micro estimation of plasma theophylline by gas-liquid chromatography with on-column butylation and nitrogen-specific detection.
mesh_terms: D002849:Chromatography, Gas / Q000379:methods; D006801:Humans; D008832:Microchemistry / Q000379:methods; D013806:Theophylline / Q000097:blood* / Q000627:therapeutic use
chemical_list: D013806:Theophylline