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Andaloussi, Mounir; Lim, Herman D.; van der Meer, Tiffany; Sijm, Maarten; Poulie, Chris B.M.; de Esch, Iwan J.P.; Leurs, Rob; Smits, Rogier A. . (2013). A novel series of histamine H4 receptor antagonists based on the pyrido[3,2-d]pyrimidine scaffold: Comparison of hERG binding and target residence time with PF-3893787. Bioorganic & Medicinal Chemistry Letters, 23(9), 2663–2670. doi:10.1016/j.bmcl.2013.02.091 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research