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This is a staphyloferrin ligand, a type of carboxylate siderophore from a Staphylococci.
Image of PDB 3MWF (Grigg, J.C., Cheung, J., Heinricks, D.E., Murphy, M.E. Staphylococcus aureus SirA specificity for staphyloferrin B is driven by localized conformational change) created with Chimera (Pettersen E.F., Goddard T.D., Huang C.C., Couch G.S., Greenblatt D.M., Meng E.C., Ferrin T.E. UCSF Chimera–a visualization system for exploratory research and analysis. J. Comput. Chem. 2004, 25: 1605-1612).