| http://www.w3.org/ns/prov#value | - Examples include, but are not limited to, methane, ethane, ethylene, acetylene, linear and branched alkanes, alkenes and alkynes with carbon numbers of C1 to C20, aromatic hydrocarbons such as benzene, naphthalene, etc., and aromatics with one or more alkyl, alkenyl and alkynyl substituents, such as toluene, xylene, cresol, styrene, etc.
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