4GH6:
reference: Structure-Based Discovery of Highly Selective Phosphodiesterase-9A Inhibitors and Implications for Inhibitor Design., Meng F, Hou J, Shao YX, Wu PY, Huang M, Zhu X, Cai Y, Li Z, Xu J, Liu P, Luo HB, Wan Y, Ke H, J Med Chem. 2012 Oct 1. PMID: 22985069

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