4-Fluorobutyrylfentanyl:MCnc:Pt:Urine:Qn:Confirm
4-fluorobutyrylfentanyl:mcnc:pt:urine:qn:confirm
4-Fluorobutyrylfentanyl [Mass/volume] in Urine by Confirmatory method
4-fluorobutyrylfentanyl [mass/volume] in urine by confirmatory method