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Chemical Name: N-Ethyl-2-pyrrolidone Synonyms: 1-Ethylpyrrolidin-2-one; 1-Ethyl-2-pyrrolidone; N-Ethylpyrrolidone; Ethyl pyrrolidone; NEP CAS No.: 2687-91-4 Molecular Formula: C6H11NO Molecular weight: 113.16 Appearance: Clear Liquid Density: 0.992g/mL at 25°C(lit.) Boiling point: 97°C 20mm Hg(lit.)