| http://www.w3.org/ns/prov#value | - If any of the groups R1 to R6 are substituted groups, the substituents are typically selected from hydrocarbonoxy groups, acyl groups, ester (that is acyloxy) groups, a halogen atom or a group containing more than one halogen atom, for example a trifluoromethyl group, or a nitrile group.
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