(2R)-1-[(1E)-4,4,4-trifluoro-3-oxobut-1-en-1-yl]pyrrolidine-2-carboxylate;1-[(1E)-4,4,4-trifluoro-3-oxobut-1-en-1-yl]proline;(2S)-1-[(1E)-4,4,4-trifluoro-3-oxobut-1-en-1-yl]pyrrolidine-2-carboxylate
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