120294-09-9 3(2-((1-Carboxy-3-phenylpropyl)amino)-1-oxopropyl)-1-methyl-2-oxo-4-imidazolidinecarboxylic acid 3-(2-(N-(1-Carboxy-3-phenylpropyl)amino)propionyl)-1-methyl-2-oxoimidazolidine-4-carboxylic acid 4-Imidazolidinecarboxylic acid, 3-(2-((1-carboxy-3-phenylpropyl)amino)-1-oxopropyl)-1-methyl-2-oxo-