| http://www.w3.org/ns/prov#value | - in which R6 is a covalent bond, a linear or branched C1-C4 alkyl radical, or a residue of formula ???Cm1H2m1??? or ???Cm1H2m1???O??? wherein m1 is a number ranging from 1 to 4; p1 is a number ranging from 0 to 5; the radicals R7, R8 and R9, which may be identical or different, are each a C1-C18 alkyl radical, a C1-C18 alkoxy radical, or a residue of formula (5) below:
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