prov:value
| - R1 and R2 are identical and are each a C1 -C4 -alkyl group or a halogen atom such as fluorine, chlorine, bromine or iodine, in particular chlorine, R3, R4, R5, R6, R7, R8 and R9 are identical or different and are each a hydrogen atom, a C1 -C10 -alkyl group or a C6 -C24 -aryl group, or two or more adjacent radicals R3, R4, R5, R6, R7, R8 and R9 together with the atoms connecting them form an aroma
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