Complex 13 demonstrated high in vitro activity against prostate, colon, and breast cancer cell lines (IC50 = 0.03, 0.25, and 0.07 μM respectively), collaborating with a significant interaction with Human Epidermal Growth Factor Receptor 2 (HER2) (–71.15 kcal/mol binding affinity) in silico. This evidence concerns the gene ERBB2 and breast cancer.