FPH2 (BRD-9424) induced functional proliferation of primary human hepatocytes in vitro. Human induced pluripotent stem (iPS) cells can be differentiated toward hepatocyte-like (iHep) cells, but replication is not great, and cells typically show an immature hepatic phenotype and have limited use as a renewable source of functional human hepatocytes. FPH2 induced hepatocyte doublings at a rate consistent with reported liver regeneration kinetics. FPH2 can be used in conjunction with FH1 (BRD-K4477), which induces a more mature phenotype.