1-Methyl-4-carboxy-2-pyrrolidone 1-Methyl-5-oxo-3-pyrrolidinecarboxylic acid 1-Methyl-5-oxopyrrolidine-3-carboxylic acid 3-Pyrrolidinecarboxylic acid, 1-methyl-5-oxo- 4-22-00-02888 (Beilstein Handbook Reference) 42346-68-9 BRN 0132515 EINECS 255-765-5