Methylenedioxypyrovalerone/Creatinine:MRto:Pt:Urine:Qn
methylenedioxypyrovalerone/creatinine:mrto:pt:urine:qn
Methylenedioxypyrovalerone/Creatinine (U) [Mass ratio]
methylenedioxypyrovalerone/creatinine (u) [mass ratio]