A metabolite: Norfentanyl is a Fentanyl metabolite. "Urine Drug Testing of Chronic Pain Patients. III. Normetabolites as Biomarkers of Synthetic Opioid Use" can shed more light on this. REF: https://watermark.silverchair.com/34-8-444.pdf?token=AQECAHi208BE49Ooan9kkhW_Ercy7Dm3ZL_9Cf3qfKAc485ysgAAAl8wggJbBgkqhkiG9w0BBwagggJMMIICSAIBADCCAkEGCSqGSIb3DQEHATAeBglghkgBZQMEAS4wEQQMpvRqRGQbVxYlbJXeAgEQgIICEjF0Ikzr4Rsy
Answered 7/31/2019
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