for the following products
Fmoc-L-beta-Homotyrosine(otbu) | Fmoc-L-beta-HTyr(tBu)-OH | Fmoc-O-tert-Butyl-L-beta-homotyrosine | N-beta-(9-Fluorenylmethyloxycarbonyl)-O-tert-butyl-L-homotyrosine and (S)-N-(9-Fluorenylmethoxycarbonyl)-3-amino-4-(4-tert-butoxyphenyl)butanoic acid
