title: Gas chromatographic-mass spectrometric determination of etorphine with stable isotope labeled internal standard.
mesh_terms: D000818:Animals; D002849:Chromatography, Gas; D004355:Drug Stability; D005048:Etorphine / Q000031:analogs & derivatives / Q000652:urine*; D007553:Isotope Labeling; D013058:Mass Spectrometry; D009019:Morphinans / Q000652:urine*; D011817:Rabbits
chemical_list: D009019:Morphinans; D005048:Etorphine