N-alpha-(9-Fluorenylmethyloxycarbonyl)-O-(nonafluoro-t-butyl)-cis-L-hydroxyproline

Reference: (2S,4R)- and (2S,4S)-Perfluoro-tert-butyl 4-Hydroxyproline: Two Conformationally Distinct Proline Amino Acids for Sensitive Application in 19F NMR; Caitlin M. Tressler and Neal J. Zondlo; J. Org. Chem. 2014; 79: 5880-5886; DOI: org/10.1021/jo5008674 ?-(S)-Trifluoromethyl proline: evaluation as a structural substitute of proline for solid state 19F-NMR peptide studies; Vladimir Kubyshkin, Sergii Afonin, Sezgin Kara, Nediljko Budisa, Pavel K. Mykhailiuk, Anne S. Ulrich; Org. Biomol. Chem. 2015; 13: 3171-3181; DOI: 10.1039/c5ob00034c.