Arginine is an essential amino acid that can be naturally produced in the body. In life science research, in order to avoid the production of by-products, it is necessary to protect the amino and guanidine groups of arginine. Fmoc Pbf arginine is an amino acid derivative obtained by protecting the amino group with Fmoc (9-fluorenylmethoxycarbonyl) and protecting the guanidine group with Pbf (2,2,4,6,7-pentamethylbenzofuran-5-sulfonyl).