New diamino-diheterophenol ligands coordinate iron(III) to make structural and functional models of protocatechuate 3,4-dioxygenase. - Farrell JR; Niconchuk JA; Renehan PR; Higham CS; Yoon E; Andrews MV; Shaw JL; Cetin A; Engle J; Ziegler CJ (Dalton transactions (Cambridge, England : 2003), 2014)