| http://www.w3.org/ns/prov#value | - , 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 halogen atom, a C1 -C10 -alkyl group, which is optionally halogenated, a C6 -C10 -aryl group, an --NR2 15, --SR15, --OSiR3 15, --SiR3 15 or --PR2 15 radical in which R15 is a halogen atom, a C1 -C10 -alkyl group or a C6 -C10 -aryl group, R5 and R6 are identical or diffe
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