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Absorption spectra (190 ÷ 450 nm) of 1 × 10−4 M 1a/1b (A) and 2a/2b (B) complexes in phosphate-buffered saline (PBS, pH 7.4) and CD spectra of 5 × 10−4 M 1a/1b (C) and 2a/2b (D) complexes in PBS, pH 7.4 outright on the prepared solutions (T 0 h) and at 9 h (T 9 h) after preparation.
