63589-93-5 L-Lysinamide, D-valyl-L-leucyl-N-(4-nitrophenyl)- L-Lysinamide, D-valyl-L-leucyl-N-(4-nitrophenyl)-, dihydrochloride S 2251 S-2251 Val-leu-lys 4-nitroanilide Valyl-leucyl-lysine 4-nitroanilide