3-Pyrrolidinecarboxylic acid, 1-(2-hydroxyethyl)-5-oxo-, monosodium salt 85414-23-9 EINECS 287-193-7 Monosodium 1-(2-hydroxyethyl)-5-oxo-3-pyrrolidinecarboxylate Sodium 1-(2-hydroxyethyl)-5-oxopyrrolidine-3-carboxylate Sodium N-(2-hydroxyethyl)-2-pyrrolidone-4-carboxylate