1,2-Pyrrolidinedicarboxylicacid, 4,4-difluoro-, 1-(1,1-dimethylethyl) ester, (S)-;(2S)-1-(tert-Butoxycarbonyl)-4,4-difluoro-2-pyrrolidinecarboxylic acid;(2S)-1-tert-Butoxycarbonyl-4,4-difluoropyrrolidine-2-carboxylic acid;
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