6EZF:
reference: Predicting Binding Free Energies of PDE2 Inhibitors. The Difficulties of Protein Conformation., Perez-Benito L, Keranen H, van Vlijmen H, Tresadern G, Sci Rep. 2018 Mar 20;8(1):4883. doi: 10.1038/s41598-018-23039-5. PMID: 29559702

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