Carbobenzoxy-valyl-glycyl-arginine-p-nitroanilide acetate; Chromozym TRY acetate;Carbobenzoxy-valyl-glycyl-arginine-p-nitroanilide acetate,benzyl ((S)-1-((2-(((S)-5-guanidino-1-((4-nitrophenyl)amino)-1-oxopentan-2-yl)amino)-2-oxoethyl)amino)-3-methyl-1-oxobutan-2-yl)carbamate acetate,Arginine Impurity