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In a pH 2.4 Britton-Robinson buffer medium,the anthracycline antibiotics mitoxantrone(MXT) could react with metal ions such as Pd(Ⅱ),Co(Ⅱ) and Cu(Ⅱ) to form 1:2(molar ratio) cationic chelates,which further reacted with the anionic dye titan yellow to form