for the following products
Fmoc-L-Tyr(tBu)-OPfp | Fmoc-Tyr(tBu)-OPfp | N-alpha-(9-Fluorenylmethyloxycarbonyl)-O-tert-butyl-L-tyrosine pentafluorphenyl ester and Fmoc-Tyr(But)-OPfp
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