91237-20-6 DL-Phenylalanine, N-(2-((4-carboxyphenyl)amino)-2-oxo-1-(phenylmethyl)ethyl)-, (SP-4-1)- N-(1-(R,S)-Carboxy-2-phenylethyl)-phe-p-AB N-(1-Carboxy-2-phenylethyl)phenylalanine-4-aminobenzoate N-Cppab