Methylenedioxypyrovalerone/Creatinine:MRto:Pt:Urine:Qn
methylenedioxypyrovalerone/creatinine:mrto:pt:urine:qn
Methylenedioxypyrovalerone/Creatinine [Mass Ratio] in Urine
methylenedioxypyrovalerone/creatinine [mass ratio] in urine