Download full text in PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... The 2,2,4,6,7-pentamethyldihydrobenzofuran-5-sulfonyl residue (Pbf) is more easily deblocked by trifluoroacetic acid (TFA) than the corresponding Pmc analog and can be used efficiently in the synthesis of arginine-containing peptides. ... As arginine side chain protectant the Pbf ...