| http://www.w3.org/ns/prov#value | - e, amides such as formamide, hexamethyl phosphoric acid triamide, N,N,N???,N???,N???-pentamethyl-N???-??-dimethylaminomethyl phosphoric acid triamide and octamethyl pyrophosphoramide, urea such as N,N,N???,N???,-tetramethyl urea, isocyanates such as phenyl isocyanate and toluyl isocyanate, and an azo compound such as azobenzene.
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