| http://www.w3.org/ns/prov#value | - In case that a compound of formula (21) with an isocyanato group R13 is to be coupled to a natural or synthetic polymer containing amino or hydroxy groups, the reaction may be carried out in an inert organic solvent such as acetonitrile, an optionally halogenated hydrocarbon, for example petroleum ether, methylcyclohexane, toluene, chloroform, methylene chloride and the like, or an ether, for exam
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