3SHY:
reference: Utilization of Halogen Bond in Lead Optimization: A Case Study of Rational Design of Potent Phosphodiesterase Type 5 (PDE5) Inhibitors., Xu Z, Liu Z, Chen T, Chen T, Wang Z, Tian G, Shi J, Wang X, Lu Y, Yan X, Wang G, Jiang H, Chen K, Wang S, Xu Y, Shen J, Zhu W, J Med Chem. 2011 Aug 11;54(15):5607-11. Epub 2011 Jul 14. PMID: 21714539

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