| http://www.w3.org/ns/prov#value | - C7 -C40 -arylalky group, a C7 -C40 -alkylaryl group, a C8 -C40 -arylalkenyl group or a halogen atom, R3 and R4 are identical or different and are a hydrogen atom, a halogen atom, a C1 -C10 -alkyl group which is optionally halogenated, a C6 -C10 -aryl group, an --NR2 10, --SR10, --OSiR3 10, --SiR3 10 or --PR2 10 radical, wherein R10 is a halogen atom, a C1 -C10 -alkyl group or a C6 -C10 -aryl group
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