| http://www.w3.org/ns/prov#value | - R1 is a monovalent alkoxy radical, oxyaryl radical or combinations thereof, or R1 is an azido moiety, R1 is essentially free of isocyanate-reactive atoms or moieties and it may be substituted with non-interferring atoms or moieties and it cannot be substituted with energetic nitrogen-containing moleties other than azido moieties; or
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