| http://www.w3.org/ns/prov#value | - yl and heterocyclyl being unsubstituted or substituted, by for example one or more radicals from the group consisting of halogen, CN, (C1-C6)alkyl, (C1-C6)alkenyl, (C1-C6)alkynyl, (C1-C6)alkyloxy, W is an oxygen atom, X and Y independently of one another are each (C1-C4)alkyl, (C1-C4)alkyloxy, each of the last-mentioned two radicals being unsubstituted or substituted by one or more halogen atoms,
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