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ethyl (2R,4S)-4-fluoropyrrolidine-2-carboxylate; CAS No.: 1523530-67-7; This ethyl fluoropyrrolidine carboxylate demonstrates our capabilities in fluorinated proline analogs. The (2R,4S) stereochemistry mimics trans-4-hydroxyproline conformations for collagen stability studies. As chemical synthesis companies, we provide circular dichroism analysis for such conformationally restricted amino esters.