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High-resolution X-ray structure determinations of chloro- and azidocobalamin·2LiCl, crystallized from concentrated aqueous LiCl solutions, show lithium cations coordinated to the phosphate O atom and to the amidic O atoms of the corrin side chains, and chloride anions held by H-bonds to the corrin amidic N atoms. The structures of the two compounds represent the first structural picture of the interactions of the cobalamin molecule with ionic species.
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Randaccio et al. (1998) studied this question.
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