English name: (S)-(-)-2-Pyrrolidone-5-carboxylic acid 

English alias: 5-OXO-L-PROLINE;5-oxoproline;5-OXO-2-PYRROLIDINECARBOXYLIC ACID;L-GLUTIMINIC ACID;L-GLUTAMIC ACID LACTAM;(-)-L-PYROGLUTAMIC ACID;L-PYROGLUTAMIC ACID;L-2-PYRROLIDONE-5-CARBOXYLIC ACID

CAS number: 98-79-3     

EINECS number: 202-700-3

Formula: C5H7NO3

Molecular weight: 129.11

Melting point: 152-162°C

Boiling point: 453.1°C at 760 mmHg

Flash point: 227.8°C

Appearance: Colorless crystal

Application: For food, medicine, cosmetics and other industries; organic synthesis intermediates, food additives