Novel η4-acyloxy-cyclohexadiene-Fe (CO) 3 complexes (with variable length of the acyloxy chain) were synthesized as potential enzyme-triggered carbon monoxide (CO)-releasing molecules (ET-CORMs). The molecular structure of two complexes was additionally confirmed by X-ray crystallography. The enzyme-triggered CO-releasing activity of the compounds was assessed under physiological conditions (37° C, 0.1 M phosphate buffer, ...
