The present invention relates to a method for producing an oligonucleic acid derivative characterized by using a phenoxyacetic acid derivative anhydride as an acylating agent and a pyridine derivative as the acylation reaction activator, in a capping step for protecting the 5'-hydroxyl group of a ribose of an oligonucleic acid derivative.

 
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> Production Of L-Iduronate Containing Polysaccharides

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