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