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O'Brien P Q, Fischer A B, Patel M V. "A Process for Preparing High-Purity (2R,3R,4S)-4-(benzo[d][1,3]dioxol-5-yl)-1-(tert-butoxycarbonyl)-2-(4-methoxyphenyl)pyrrolidine-3-carboxylic acid" [P]. US Patent, US 11130281 B2, 2017-02-28.
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