
Direct determination of N-methyl-2-pyrrolidone metabolites in urine by HPLC-electrospray ionization-MS/MS using deuterium-labeled compounds as internal standard
Keywords: N-Methyl-2-pyrrolidone; 5-Hydoxy-N-methyl-2-pyrrolidone; 2-Hydroxy-N-methylsuccinimide; Electrospray ionization-MS/MS; Deuterium-labeled compound; Biological monitoring