N-acetyl-L-aspartate/Creatinine:MRto:Pt:Urine:Qn
n-acetyl-l-aspartate/creatinine:mrto:pt:urine:qn
N-acetyl-L-aspartate/Creatinine [Mass Ratio] in Urine
n-acetyl-l-aspartate/creatinine [mass ratio] in urine