L-potassium pyroglutamate, EINECS 225-373-9, potassium-PCA, (S)-Pyrrolidone-5-carboxylic acid potassium salt, L-pyrrolidonecarboxylic acid potassium salt, L-Proline,5-oxo-,monopotassium salt, Potassium(S)-2-pyrrolidone-5-carboxylate, Potassium 5-oxo-L-prolinate, L-Proline,5-oxo-,potassium salt (1:1), Potassium L-pyroglutamate, L-Proline,5-oxo-,monopotassium salt (9CI), Proline,5-oxo-,potassium salt,L-(8CI)