1TL8:
reference: Synthesis and Mechanism of Action Studies of a Series of Norindenoisoquinoline Topoisomerase I Poisons Reveal an Inhibitor with a Flipped Orientation in the Ternary DNA-Enzyme-Inhibitor Complex As Determined by X-ray Crystallographic Analysis., Ioanoviciu A, Antony S, Pommier Y, Staker BL, Stewart L, Cushman M, J Med Chem 2005 Jul 28;48(15):4803-4814. PMID: 16033260

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