BAY 1000394 (Roniciclib) is a potent inhibitor of pan-CDK, that inhibits the kinase activity of the cell-cycle cyclin-dependent kinases (CDKs), with IC50 of 7, 9, 11, 25 and 5 nmol/L for CDK1, CDK2, CDK4, CDK7 and CDK9, respectively. It induces cell-cycle arrest and apoptosis and exhibits potent antitumor activity.