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The crystal structure of the title compound, C 5 H 8 FNO 2 , at 100 K, displays inter­molecular N—H⋯O hydrogen bonding between the ammonium and carboxyl­ate groups as a result of its zwitterionic nature in the solid state. The five-membered ring adopts an envelope conformation with the C atom at the 3-position as the flap. The compound is of inter­est with respect to the synthesis and structural properties of synthetic collagens. The absolute structure was determined by comparison with the commercially available material.

(2S,4R)-4-Fluoropyrrolidinium-2-carboxylate