4FF8:
reference: Highly selective 2,4-diaminopyrimidine-5-carboxamide inhibitors of Sky kinase., Powell NA, Hoffman JK, Ciske FL, Kaufman MD, Kohrt JT, Quin J 3rd, Sheehan DJ, Delaney A, Baxi SM, Catana C, McConnell P, Ohren J, Perrin LA, Edmunds JJ, Bioorg Med Chem Lett. 2013 Feb 15;23(4):1046-50. doi: 10.1016/j.bmcl.2012.12.013., Epub 2012 Dec 20. PMID: 23312472

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