for the following products
(4S,5R)-3-(N-(9-fluorenylmethyloxycarbonyl)-L-alaninyl)-2,25-trimethyloxazolidine-4-carboxylic acid | (4S,5R)-3-(N-(9-Fluorenylmethyloxycarbonyl)-L-isoleucinyl)-2,2,5-trimethyloxazolidine-4-carboxylic acid | Fmoc-L-Ala-L-Thr[PSI(Me,Me)Pro]-OH and Fmoc-Ala-Thr(Psi(Me,Me)pro)-OH
