title: Simultaneous determination of theophylline and caffeine after extractive alkylation in small volumes of plasma by gas chromatography--mass spectrometry.
mesh_terms: D000478:Alkylation; D001049:Apnea / Q000188:drug therapy* / Q000378:metabolism; D002110:Caffeine / Q000097:blood*; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods; D006801:Humans; D007231:Infant, Newborn; D007232:Infant, Newborn, Diseases / Q000188:drug therapy; D007235:Infant, Premature, Diseases / Q000188:drug therapy; D013806:Theophylline / Q000097:blood* / Q000627:therapeutic use
chemical_list: D002110:Caffeine; D013806:Theophylline