Fac-[Re(CO)3(L3)(H2O)][NO3] (Compound 3), a rhenium(I) tricarbonyl aqua complex, acts as an anticancer agent through the induction of mitochondrial dysfunction. It exhibits cytotoxicity against prostate cancer cells, demonstrating an IC50 value of 0.32 μM in PC-3 cells. This compound predominantly localizes to the mitochondria, reducing ATP production and triggering paraptosis in PC3 cells, while not initiating necrosis, apoptosis, or autophagy [1].