1-(1-Methylethyl)-2-pyrrolidinone 1-(Isopropyl)pyrrolidin-2-one 1-Isopropyl-2-pyrrolidinone 2-Pyrrolidinone, 1-(1-methylethyl)- 2-Pyrrolidinone, 1-isopropyl- 3772-26-7 5-21-06-00329 (Beilstein Handbook Reference) BRN 0109977 EINECS 223-215-3 N-Isopropylbutyrolactam N-Isopropylpyrrolidinone