| prov:value
| - R8 --O--R8' where R8 and R8' may be identical or different and each is (I) alkyl of 1 to 15, especially of 3 to 8, carbon atoms, (II) phenyl or (III) alkylphenyl of a total of 7 to 14, especially 7 to 10, carbon atoms, and/or (d2) an ester which in total contains from 2 to 34, especially from 2 to 14, carbon atoms, and has the formula ##STR7## where R9 is (I) hydrogen, (II) alkyl of 1 to 12,especi
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