3-IN-PP1, a potent protein kinase D (PKD) inhibitor, exhibits pan-PKD inhibitory activity with IC50 values of 108 nM for PKD1, 94 nM for PKD2, and 108 nM for PKD3. Additionally, it serves as a broad-spectrum anticancer agent by inhibiting the growth of various tumor cells. 3-IN-PP1 is utilized in cancer research [1].