| http://www.w3.org/ns/prov#value | - the symbols R1 and R9 are identical or different and represent a hydrogen atom or an alkyl radical comprising from 1 to 8 carbon atoms, and most particularly 1 carbon atom, the symbols R2, R3, R4, R5, R6, R7 and R8 are identical or different and represent an alkyl radical containing from 1 to 8 carbon atoms, n is an integer or decimal number which may be from 0 to 10, at least one of the radicals
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