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1 H NMR signals of these paramagnetic complexes were fully assigned by means of relaxation and two-dimensional NMR techniques. These studies revealed that SN binds transition metal and lanthanide ions and forms stable metal-drug complexes, with the metal located at the quinolinequinone- picolinate site. This conWguration requires a »1808 twist of the C2)C29 bond in the crystal structure of the drug. The hyperWne-shifted 1 H NMR signals of the Co 21 -SN complex are signiWcantly changed upon addition of calf thymus DNA or poly(dA-dT), indicating direct binding of Co 21 -SN complex with DNA.

NMR Studies of metal complexes and DNA binding of the quinone-containing antibiotic streptonigrin