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Zwitterionic spirosilicates with two di-anions of α-amino acids as (O,N)-chelators (3a–3f) [49,50]. The substituents R,R′ at N and the α-C atom in the generic drawings of the diastereomers 3 and 3′ may also represent -CH2CH2CH2- and thus account for the di-anion of l-proline as an (O,N)-chelator as well.
