4Y8C:
reference: Structural Asymmetry of Phosphodiesterase-9A and a Unique Pocket for Selective Binding of a Potent Enantiomeric Inhibitor., Huang M, Shao Y, Hou J, Cui W, Liang B, Huang Y, Li Z, Wu Y, Zhu X, Liu P, Wan Y, Ke H, Luo HB, Mol Pharmacol. 2015 Nov;88(5):836-45. doi: 10.1124/mol.115.099747. Epub 2015 Aug , 27. PMID: 26316540

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