Gravar-mail: The development of N-α-(2-carboxyl)benzoyl-N(5)-(2-fluoro-1-iminoethyl)-L-ornithine amide (o-F-amidine) and N α-(2-carboxyl)benzoyl-N(5)-(2-Chloro-1-iminoethyl)-L-ornithine amide (o-Cl-amidine) as second generation Protein Arginine Deiminase (PAD) inhibitors.