2FM5:
reference: Enantiomer Discrimination Illustrated by the High Resolution Crystal Structures of Type 4 Phosphodiesterase., Huai Q, Sun Y, Wang H, Macdonald D, Aspiotis R, Robinson H, Huang Z, Ke H, J Med Chem. 2006 Mar 23;49(6):1867-1873. PMID: 16539372

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