82155-66-6 L-Valinamide, N-(3-carboxy-1-oxopropyl)-L-alanyl-L-tyrosyl-L-leucyl-N-(4-nitrophenyl)- Suc-ala-tyr-leu-val-pna Succinyl-alanyl-tyrosyl-leucyl-valyl-4-nitroanilide Succinyl-alanyl-tyrosyl-leucyl-valyl-para-nitroanilide