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Product ion spectra obtained from the (a) [QB2 + 3NH4+ + cisPt2+−11H+]6- and (b) [QB23 + 3NH4+ + cisPt2+−11H+]6- precursor ions at m/z 1406.923 and 1409.872, respectively. These species were generated by treating homo-bimolecular d(GGGGTCATTGGGG)]2 (QB2) and hetero-bimolecular d(GGGGTCATTGGGG)]·[d(GGGGTCGTTGGGG)] (QB23) quadruplexes with cisplatin (insets). Reproduced with permission from ref. 81.
