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Thiazoline and oxazoline formation: (a) schematic for cyclodehydration of Cys and Ser residues in nascent proteins to thiazoline and oxazoline rings; (b) the V. cholerae siderophore vibriobactin with methyloxazoline rings; the Y. pestis siderophore yersiniabactin with thiazoline and thiazole rings. The dihydroaromatic thiazolines and methyoxazolines are part of the ferric iron chelation set.
