3PLK:
reference: Correlating structure and ligand affinity in drug discovery: a cautionary tale involving second shell residues., Tziridis A, Rauh D, Neumann P, Kolenko P, Menzel A, Brauer U, Ursel C, Steinmetzer P, Sturzebecher J, Schweinitz A, Steinmetzer T, Stubbs MT, Biol Chem. 2014 Jul 1;395(7-8):891-903. doi: 10.1515/hsz-2014-0158. PMID: 25003390

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