Deoxyribonuclease I (DNase I) footprinting methodology was used to analyze oligodeoxyribonucleotide duplexes containing unique and single, site-specific adducts of trinuclear bifunctional platinum compound, [{trans-PtCl(NH3 )2}2l-trans-Pt(NH3 )2{H2N(CH2 )6NH2}2 ] 4+ (BBR3464) and the results were compared with DNase I footprints of some adducts of con-ventional mononuclearcis-diamminedichloroplatinum(II) (cisplatin).