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The crystal structure of a bivalent glycocluster containing aromatic amides reveals that alkylation of secondary amides alters amide configuration and thus carbohydrate presentation. This also facilitates non covalent interactions (azide-azide, carbonyl-pyranose and aromatic-pyranose) and thus carbohydrate-carbohydrate stacking.
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Tosin et al. (2004) studied this question.
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