6TFA:
reference: Engineered Artificial Carboligases Facilitate Regioselective Preparation of Enantioenriched Aldol Adducts., Macdonald DS, Garrabou X, Klaus C, Verez R, Mori T, Hilvert D, J Am Chem Soc. 2020 Jun 10;142(23):10250-10254. doi: 10.1021/jacs.0c02351. Epub, 2020 May 28. PMID: 32427470

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