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Binding interactions between ibuprofen and the COX-2 binding site. (A) Conformation of ibuprofen in the receptor-binding pocket. (B) The intermolecular binding interactions between ibuprofen and COX-2 presented by Ligplot plus program. The hydrophobic interactions between the ligand and COX-2, red lines; H-bonds, green lines; and protein residues involved in hydrophobic contacts, red spikes.
