N-ALPHA-(9-FLUORENYLMETHYLOXYCARBONYL)-N'-2,2,4,6,7-PENTAMETHYLDIHYDROBENZOFURAN-5-SULFONYL-D-ARGININE N-ALPHA-(9-FLUORENYLMETHOXYCARBONYL)-N-OMEGA-2,2,4,6,7-PENTAMETHYLDIHYDROBENZOFURAN-5-SULFONYL-D-ARGININE N-ALPHA-9-FLUORENYLMETHOXYCARBONYL-NG-2,2,4,6,7-PENTAMETHYLDIHYDROBENZOFURAN-5-SULFONYL-D-ARGININE