| http://www.w3.org/ns/prov#value | - p to twenty carbon atoms; and X and X' independently are a halo, a substituted or unsubstituted aryl group Ar-- as defined above, a lower alkyl or a substituted lower alkyl having from 1 to 4 carbon atoms, an alkoxy group having from 1 to 4 carbon atoms, a haloalkyl having from 1 to 4 carbon atoms, an acyloxy group having from 1 to 4 carbon atoms, an acylamido having from 1 to 10 carbon atoms, sat
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