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 two macrotricyclic ligands composed of two face - to - face octadentate metal chelates were synthesized . 
 these cage - shaped disodium complexes had special recognition ability for various counter anions . 
 specific chiral dicarboxylates bound to the complexes within the cavity and exhibited chirality induction properties . for instance , n - boc - asp dianion strongly induced circular dichroism ( cd ) signals , but n - boc - glu dianion , which is one carbon longer , did not . 
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