SEARCH Articles Figures Tables Catechol Catecholate Catecholate siderophore complexes Enterobactin catechol-containing siderophore Siderophore Siderophore catecholate Siderophore catecholate Siderophores Siderophores catechol Siderophores catechol Siderophores catecholate Siderophores catecholate type Siderophores catecholate units