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Three conjugates of imidazole (Im)-pyrrole (Py) diamide and a DNA-alkylating moiety derived from the antibiotic duocarmycin A were synthesized, and their sequence specificity, reactivity, and antitumor activity comparatively examined. Sequencing gel analysis indicated that ImPyDu (1) alkylates DNA at the 3' end of AT-rich sequences at micromolar concentration. ImPyDu86 (2) reacts with DNA at AT-rich...
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