3RI3:
reference: Structural and Biochemical Analyses of Regio- and Stereospecificities Observed in a Type II Polyketide Ketoreductase., Javidpour P, Korman TP, Shakya G, Tsai SC, Biochemistry. 2011 May 31;50(21):4638-49. Epub 2011 May 4. PMID: 21506596

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