| http://www.w3.org/ns/prov#value | - In case that a compound of formula (21) with an activated ester or amide group R13 is to be coupled to the surface of a bulk material or to a natural or synthetic polymer containing amino, thiol or hydroxy groups, the reaction may be carried out, for example, at room temperature or at elevated temperature, for example at about 20 to 100??? C., in an aprotic medium.
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