The molecule is conjugate acid of N-benzoyl-D-arginine-4-nitroanilide arsing from protonation of the side-chain guanidine function of the arginine residue. It is a conjugate acid of a N-benzoyl-D-arginine-4-nitroanilide.
[(4R)-4-benzamido-5-(4-nitroanilino)-5-oxopentyl]-(diaminomethylidene)azanium