Fig. 1: Main functional groups of siderophores and examples of bacterial siderophores for each group.
From: New insights into radiolabelled siderophores for molecular imaging of bacterial infections

Adapted from Siderite and PubChem, created in ChemSketch59. (1) Carboxylates: a Staphyloferrin B, b Proferrorosamine A; (2) Catecholates and Phenolates: c Enterobactin, d Acinetobactin; (3) Hydroxamates: e Putrebactin, f Desferrioxamine B; (4) Mixed siderophores: g Aerobactin, h Quinolobactin, i Salmochelin SX.