| http://www.w3.org/ns/prov#value | - Suitable petroleum-type unsaturated hydrocarbons include aromatic hydrocarbons such as styrene, ??-methyl styrene, vinyltoluene, vinylxylene, propenylbenzene, indene, methylindene, ethylindene; and aliphatic or alicyclic hydrocarbons such as butene, pentene, hexene, heptene, octene, butadiene, pentadiene, cyclopentadiene, dicyclopentadiene and the like.
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