Description General description N-Methylsuccinimide is a metabolite of N-methyl-2-pyrrolidone (NMP) and its presence in in plasma and urine can be used as a biomarker of exposure to NMP. Hydrogen bonded complexes between N-methylsuccinimide and phenols (pKa = 10.2 → 6) are investigated by infrared spectrometry. Application N-Methylsuccinimide was employed as model compound to investigate the mechanism of enolization step by density-functional theory (DFT) calculations. Packaging 5, 25 g in glass bottle