| http://www.w3.org/ns/prov#value | - ropionic acid, 1,2-dihydroxybenzoic acid, gallic acid and esters e.g. methyl gallate, ethyl gallate, propyl gallate, tannic acid, and 3,4-dihydroxy-benzoic acid esters such as ethyl 3,4-dihydroxybenzoate and n-butyl 3,4-dihydroxybenzoate are preferred, with those described in EP-B 692 733 and EP-A 903 625 being particularly preferred e.g. 3,4-dihydroxy-benzophenone and 3,4-dihydroxy-benzonitrile.
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