| http://www.w3.org/ns/prov#value | - If an oligomer is being elongated by reacting the carboxy group or derivative on the oligomer with a hydroxy group on a sugar, then one protects all hydroxy or other functional groups that are not involved in the coupling step and could interfere with the coupling step, and reacts the remaining hydroxy group with the carboxylic acid or derivative on the oligomer.
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