N-Desethyl Isotonitazene/Creatinine:MRto:Pt:Urine:Qn:Confirm
n-desethyl isotonitazene/creatinine:mrto:pt:urine:qn:confirm
N-Desethyl Isotonitazene/Creatinine [Mass Ratio] in Urine by Confirmatory method
n-desethyl isotonitazene/creatinine [mass ratio] in urine by confirmatory method