for the following products
(S)-2-((tert-Butoxycarbonyl)amino)-5-(3-((2,2,4,6,7-pentamethyl-2,3-dihydrobenzofuran-5-yl)sulfonyl)guanidino)pentanoic acid | Boc-Arg(Pbf)-OH | Boc-L-Arg(Pbf)-OH and N-Boc-N'-(2,2,4,6,7-Pentamethyldihydrobenzofuran-5-sufonyl)-L-arginine