64816-19-9 D-Prolyl-L-phenylalanyl-N-(4-nitrophenyl)-L-argininamide H-D-Pro-phe-arg-p-nitroanilide H-D-Prolyl-phenylalanyl-arginine-para-nitroanilide L-Argininamide, D-prolyl-L-phenylalanyl-N-(4-nitrophenyl)- Pro-phe-arg-p-nitroanilide Prolyl-phenylalanyl-arginine-p-nitroanilide S-2302 S-2648 prolyl-phenylalanyl-arginine-4-nitroanilide