BDP9066 is a potent and selective myotonic dystroprelated Cdc42-binding kinase MRCK inhibitor with an IC50 of 64 nM for MRCKβ in SCC12 cells, Ki values of 0.0136 nM and 0.0233 nM for MRCKα/β in house determinations, respectively. BDP9066 has therapeutic effect on skin cancer by reducing substrate phosphorylation.