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Two conformationally constrained pseudo-cyclopeptides (1, 2) consisting of pyrrole-, pyridine-, and cystine-moieties were designed and synthesized as neutral receptors for anionic guests. The anion recognition abilities of these two receptors were examined photometrically in acetonitrile solution. The UV–vis study revealed that the [1+1] receptor (1) formed 1:1 complexes with anions, whereas the [2+2]...
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