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Capillary HPLC-ESI--MS characterization of 11-mer 5'-CGG ACX AGA AG-3' containing 6-Cl-Pu (A), 16-mer 5'-GAA GAC CTX GGC GTC C-3' containing N6-HB-dA (B), 11-mer 5'-CGG ACX AGA AG-3' containing 1,N6-HMHP-dA (C) and 18-mer 5'-TCA TXG AAT CCT TCC CCC-3' containing N6,N6-DHB-dA (D).
