70967-97-4 L-Phenylalaninamide, N-(3-carboxy-1-oxopropyl)-L-alanyl-L-alanyl-L-prolyl-N-(4-nitrophenyl)-, (+-)- Saappna Suc-aapf-pna Suc-ala-ala-pro-phe-4-NA Succinyl-alanyl-alanyl-prolyl-phenylalanine-4-nitroanilide Succinyl-alanyl-alanyl-prolyl-phenylalanine-p-nitroanilide