1-Methyl-2-pyrrolidinone 1-methylpyrrolidin-2-one 2-PYRROLIDONE,1-METHYL MFC5 H9 N1 O1 2-pyrrolidinone, 1-methyl- 872-50-4 InChI=1/C5H9NO/c1-6-4-2-3-5(6)7/h2-4H2,1H