4JR3:
reference: Protein Kinase Inhibitor Design by Targeting the Asp-Phe-Gly (DFG) Motif: The Role of the DFG Motif in the Design of Epidermal Growth Factor Receptor Inhibitors., Peng YH, Shiao HY, Tu CH, Liu PM, Hsu JT, Amancha PK, Wu JS, Coumar MS, Chen CH, Wang SY, Lin WH, Sun HY, Chao YS, Lyu PC, Hsieh HP, Wu SY, J Med Chem. 2013 May 23;56(10):3889-903. doi: 10.1021/jm400072p. Epub 2013 May, 10. PMID: 23611691

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