for the following products
Fmoc-Glu(OBut)-OPfp | N-(9-Fluorenylmethoxycarbonyl)-L-glutamic acid alpha-pentafluorophenyl gamma-tert-butyl ester | N-alpha-(9-Fluorenylmethyloxycarbonyl)-L-glutamic-acid-gamma-tert-butyl ester pentafluorphenyl ester and Fmoc-Glu(OtBu)-OPfp
