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(A) 3D-structure of PPAP 23 showing the hydrophobic pocket (dark blue) and the hydrophilic shell; the gray atoms belong to the hydrophilic substructure, and the oxygen atoms of the four carbonyl functionalities are highlighted in red. (B) crystal structure of an Fe- PPAP complex showing a highly defined octahedral coordination of the 1,3-diketone motif to an Fe(III)-center. The iron in the middle (Fe1A) and the oxygen atoms are highlighted in red.
