Isolated from Streptomyces spiralis. Antibiotic. Antifungal and anti-yeast activity. Inhibits platelet aggregation induced by collagen or ADP. Has no effect on thrombin-induced platelet aggregation. Potent, cell permeable, reversible, ATP-competitive and broad spectrum inhibitor of protein kinases. Inhibits protein kinase A, CaM kinase, myosin light chain kinase, protein kinase C, protein kinase G, CDK1/cyclin B, CDK2/cyclin A, CDK4/cyclin D, CDK5/p25, GSK-3beta and Pim-1 kinase. Key apoptosis inducer. Topoisomerase II (Topo II) inhibitor.