No abstract available
MeSH terms
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Analgesics, Opioid / chemistry*
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Chromatography, High Pressure Liquid
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Fentanyl / analogs & derivatives*
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Fentanyl / chemistry
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Gas Chromatography-Mass Spectrometry
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Humans
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Illicit Drugs / chemistry*
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Magnetic Resonance Spectroscopy
Substances
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Analgesics, Opioid
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Illicit Drugs
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butyrfentanyl
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Fentanyl