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Thurston, L. S., Irie, H., Tani, S., Han, F. S., Liu, Z. C., Cheng, Y. C., Lee, K. H. 1986. Antitumor Agents. 78. Inhibition of Human DNA Topoisomerase II by Podophyllotoxin and Alpha-peltatin Analogues. J Med Chem, 29: 1547-1550.