| http://www.w3.org/ns/prov#value | - Where X is one of such halogens as fluorine, chlorine, bromine or the like, and R denoted a trivalent radical of aromatic compound and aliphatic compound or a combination set up by both of the said compounds, and both R and R are divalent radical of aliphatic compound, alicyclic compound and aromatic compound or a combination of two or more of them.
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