| DL-2-Pyrrolidinone-5-carboxylic acid |
| dl-2-pyrrolidone-5-carboxylic acid |
| DL-Pyroglutamic acid |
| DL-5-oxo-2-pyrrolidine carboxylic acid |
| 2-Pyrrolidone-5-carboxylic acid |
| DL-5-Oxo-2-pyrrolidinecarboxylic acid |
| (±)-2-Pyrrolidone-5-carboxylic acid |
| (n)-2-Pyrrolidinone-5-carboxylic acid |
| H-DL-Pyr-OH |
| DL-Glutamic Acid Lactam |
