Extension of the Temporal Window for the Determination of Alpha-Methylthiofentanyl and Thiofentanyl in Rat Urine by Monitoring the Metabolite Norfentanyl Using Online Solid-Phase Extraction (SPE) Coupled with Ultra-High Performance Liquid Chromatography–Tandem Mass Spectrometry (UHPLC–MS/MS)

Qingjia Zhaoa State Key Laboratory of New Drug and Pharmaceutical Process, China State Institute of Pharmaceutical Industry, Shanghai, China;b Shanghai Key Laboratory of Crime Scene Evidence, Shanghai Institute of Forensic Science, Shanghai, China

Rong Wangb Shanghai Key Laboratory of Crime Scene Evidence, Shanghai Institute of Forensic Science, Shanghai, China

Chen Liangb Shanghai Key Laboratory of Crime Scene Evidence, Shanghai Institute of Forensic Science, Shanghai, China

Yao Chena State Key Laboratory of New Drug and Pharmaceutical Process, China State Institute of Pharmaceutical Industry, Shanghai, China;c Shanghai Professional and Technical Service Center for Biological Material Drug-ability Evaluation, Shanghai, China

Zhenhai Shengb Shanghai Key Laboratory of Crime Scene Evidence, Shanghai Institute of Forensic Science, Shanghai, China

Zhiru Xua State Key Laboratory of New Drug and Pharmaceutical Process, China State Institute of Pharmaceutical Industry, Shanghai, China;c Shanghai Professional and Technical Service Center for Biological Material Drug-ability Evaluation, Shanghai, ChinaCorrespondence[email protected] [email protected]

Yurong Zhangb Shanghai Key Laboratory of Crime Scene Evidence, Shanghai Institute of Forensic Science, Shanghai, ChinaCorrespondence[email protected] [email protected]

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Extension of the Temporal Window for the Determination of Alpha-Methylthiofentanyl and Thiofentanyl in Rat Urine by Monitoring the Metabolite Norfentanyl Using Online Solid-Phase Extraction (SPE) Coupled with Ultra-High Performance Liquid Chromatography–Tandem Mass Spectrometry (UHPLC–MS/MS)

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Extension of the Temporal Window for the Determination of Alpha-Methylthiofentanyl and Thiofentanyl in Rat Urine by Monitoring the Metabolite Norfentanyl Using Online Solid-Phase Extraction (SPE) Coupled with Ultra-High Performance Liquid Chromatography–Tandem Mass Spectrometry (UHPLC–MS/MS)

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