3-Pyrrolidinecarboxylic acid, 1-methyl-5-oxo-, sodium salt 85414-22-8 EINECS 287-192-1 Sodium 1-methyl-5-oxo-3-pyrrolidinecarboxylate Sodium 1-methyl-5-oxopyrrolidine-3-carboxylate Sodium N-methyl-2-pyrrolidone-4-carboxylate