1-ETHYL-2-PYRROLIDINONE 1-Ethylpyrrolidin-2-one 2-Pyrrolidinone, 1-ethyl- 2687-91-4 5-21-06-00328 (Beilstein Handbook Reference) BRN 0107971 EINECS 220-250-6 N-Ethylpyrrolidinone N-Ethylpyrrolidone