prov:value
| - R1, R2, R3 are identical or different and represent chlorine, a C1-C18-alkyl or C1-C18-alkoxy group, which may optionally be interrupted by oxygen, nitrogen or sulphur atoms, or a C6-C12-aryl, C6-C12-aryloxyoxy, C7-C18-alkylaryl or alkylaryloxy group, with the proviso that at least one of the groups R1 to R3 is an alkoxy, aryloxy or alkylaryloxy group or a chlorine atom,
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