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Chemical structures of some common bifunctional chelators. DOTA = 1,4,7,10-tetraazacyclododecane-1, 4, 7,10-tetraacetic acid; NOTA = 1,4,7-triazacyclononane-1,4,7-triacetic acid; DTPA = diethylene triamine pentaacetic acid; TETA = 1,4,8,11-tetraazacyclododenane-1,4,8,11-tetraacetic acid.
