prov:value
| - R1 and R2 independently of one another each preferably represent hydrogen, C1 -C15 -alkyl, in particular also 3,7,11-trimethyldodecyl, represent respectively optionally fluorine-, chlorine- or bromine-substituted C1 -C8 -alkyl, C3 -C7 -cycloalkyl, C3 -C7 -cycloalkyl-C1 -C4 -alkyl, C1 -C6 -hydroxyalkyl, C1 -C4 -alkanoyloxy-C1 -C6 -alkyl, C1 -C4 -alkoxy-C1 -C6 -alkyl, aryl-C1 -C4 -alkoxy-C1 -C6 -alk
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